The anti-piracy laser device uses lethal laser beam to give a visual warning to pirates.

The laser beam—emitting device and the receiver are considered to____of a CD player．

听力原文：M：Do I look good? I mean，will the interviewers like my clothes? I want to give them a good impression．

W：You look great，honey．Remember，be yourself．Anyway，they ale looking for someone who knows how to run an apartment，not a model．

Q：What can we know about the man?

(17)

A．He wants to be a model.

B．He cares too much about his appearance.

C．He is about to attend an interview.

D．He is in charge of an apartment.

Section D

听力原文： A researcher says lead in the environment could be a major cause of violence by young people. Doctor Herbert Needleman is a professor at the University of Pittsburgh School of Medicine in Pennsylvania and he presented his findings at the yearly meeting of the American Association for the Advancement of Science. Doctor Needleman says the presence of lead in the brain changes the neurons that control actions and that can cause a person to act in antisocial and criminal ways.

In the 1970s, Doctor Needleman found lower scores on intelligence tests even in children who did not have such signs of lead poisoning. After that, lead was removed from gasoline and paint in the United States. Yet many homes still have old lead paint. Lead was also used in older water pipes. In fact, officials just announced stronger testing and reporting requirements as from next year for lead in American drinking water.

The newest research shows that even very small amounts of lead in bones can affect brain development. A simple blood test can measure lead except that an X-ray process is needed to measure levels in bone. In 2004, such tests were done on 190 young people who were in jail and the findings showed that their average levels were higher than normal. And, in 1998, three hundred children were studied and the test scores showed higher levels of aggression and learning problems in those with increased levels of lead. Yet these levels were still considered safe by the government.

A researcher says lead in the environment could be a major cause of violence by young people. Doctor Herbert Needleman is a【21】______ at the University of Pittsburgh School of Medicine in Pennsylvania and he【22】______his findings at the yearly meeting of the American Association for the Advancement of Science. Doctor Needleman says the presence of lead in the 【23】______changes the neurons that control actions and that can cause a person to act in antisocial and【24】______ways.

In the 1970s, Doctor Needleman found lower scores on【25】______even in children who did not have such signs of lead poisoning. After that, lead was【26】______gasoline and paint in the United States. Yet many homes still have old lead paint. Lead was also used in older【27】______. In fact, officials just announced stronger testing and reporting requirements as from next year for lead in American drinking water.

The newest research shows that even very small amounts of lead in bones can affect brain development. A simple【28】______can measure lead except that an X-ray process is needed to measure levels in bone. In 2004, such tests were done on 190 young people who were【29】______and the findings showed that their average levels were higher than normal. And, in 1998, three hundred children were studied and the test scores showed higher levels of【30】______problems in those with increased levels of lead. Yet these levels were still considered safe by the government.

(16)

The laser beam—emitting device and the receiver are considered to___________0f a CD player．

"Clean your plate!" and "Be a member of the clean-plate club!" Just about every kid in the US has heard this from a parent or grandparent. Often, it's accompanied by an appeal: "Just think about those starving orphans(孤儿) in Africa!"

Sure, we should be grateful for every bite of food. Unfortunately, many people in the US take a few too many bites. Instead of saying "clean the plate", perhaps we should save some food for tomorrow.

According to news reports, US restaurants are partly to blame for the growing bellies(肚子). A waiter puts a plate of food in front of each customer, with two to four times the amount recommended by the government, according to a USA Today story.

Americans traditionally associate quantity with value and most restaurants try to give them that. They serve large portions to stand apart from competitors and to give the customers value. They prefer to have customers complain about too much food rather than too little.

Barbara Rolls, a nutrition professor at Pennsylvania State University, told USA Today that restaurant portion sizes began to grow in the 1970s, the same time that the American waistline began to expand.

Health experts have tried to get many restaurants to serve smaller portions. Now, apparently, some customers are calling for this too. A restaurant industry trade magazine reported last month that 57 percent of more than 4,000 people surveyed believed restaurants serve portions that are too large; 23 percent had no opinion; 20 percent disagreed.

But a closer look at the survey indicates that many Americans who can't afford fine dining still prefer large portions. Seventy percent of those earning at least $150,000 per year prefer smaller portions. But only 45 percent of those earning less than $25,000 want smaller.

It's not that working class Americans don't want to eat healthy. It's just that after long hours at low-paying jobs, getting less on their plate hardly seems like a good deal. They live from paycheck to paycheck, happy to save a little money for next year's Christmas presents.

By saying "Be a member of the clean-plate-club!"(Para. 1) a parent or grandparent is asking the children to______.

A．wash dishes after meals

B．eat all the food on their plate

C．save food for the starving Africans

D．reserve food for the future

To get from Kathmandu to the tiny village in Nepal, Dave Irvine-Halliday spent more than two days. When he arrived, he found villagers working and reading around battery-powered lamps equipped with light-emitting diodes, or LEDs--the same lamps he had left there in 2000.

Irvine-Halliday, an American photonics engineer, was not surprised. He chose to use LED bulbs because they are rugged, portable, long-lived, and, extremely efficient. Each of his lamps produces a useful amount of illumination from just one watt of power. Villagers use them about four hours each night, then top off the battery by pedaling a generator for half an hour. The cool, steady beam is a huge improvement over lamps still common in developing countries. In fact, LEDs have big advantages over familiar incandescent (白炽的) lights as well--so much so that Irvine-Halliday expects LEDs will eventually take over from Thomas Edison's old lightbulb as the world's main source of artificial illumination.

The dawn of LEDs began about 40 years ago, but early LEDs produced red or green glows suitable mainly for displays in digital clocks and calculators. A decade ago, engineers invented a semiconductor crystal made of an aluminum compound that produced a much brighter red light. Around the same time, a Japanese engineer developed the first practical blue LED. This small advance had a huge impact because blue, green, and red LEDs can be combined to create most of the colors of the rainbow, just as that in a color television picture.

These days, high-intensity color LEDs are showing up everywhere such as the traffic lights. The reasons for the rapid switchover are simple. Incandescent bulbs have to be replaced annually, but LED traffic lights should last five to yen years. LEDs also use 80 to 90 percent less electricity than the conventional signals they replace. Collectively, the new traffic lights save at least 400 million kilowatt-hours a year in the United States.

Much bigger savings await if LEDs can supplant Mr. Edison's bulb at the office and in the living room. Creating a white-light LED that is energy-saving, cheap and appealing has proved a tough engineering challenge. But all the major lightbulb makers--including General Electric, Philips, and Osram-Sylvania--are teaming up with semiconductor manufacturers to make it happen.

From the first paragraph, we can see that Dave Irvine-Halliday ______.

A．is a mountain climber

B．went to that village to repair the lamps

C．found the villagers were using the lamps he had given them

D．has visited the small village several times

to get from Kathmandu to the tiny village in Nepal, Dave Irvine-Halliday spent more than two days. When he arrived, he found villagers working and reading around battery-powered lamps equipped with light-emitting diodes, or LEDs--the same lamps he had left there in 2000.

Irvine-Halliday, an American photonics engineer, was not surprised. He chose to use LED bulbs because they are rugged, portable, long-lived, and extremely efficient. Each of his lamps produces a useful amount of illumination from just one watt of power. Villagers use them about four hours each night, then top off the battery by pedaling a generator for half an hour. The cool, steady beam is a huge improvement over lamps still common in developing Countries. In fact, LEDs have big advantages over familiar incandescent (白炽的)lights as well--so much so that Irvine-Halliday expects LEDs will eventually take over from Thomas Edison's old lightbulb as the world's main source of artificial illumination.

The dawn of LEDs began about 40 years ago, but early LEDs produced red or green glows suitable mainly for displays in digital clocks and calculators. A decade ago, engineers invented a semiconductor crystal made of an aluminum compound that produced a much brighter red light. Around the same time, a Japanese engineer developed the first practical blue LED. This small advance had a huge impact because blue, green, and red LEDs can be combined to create most of the colors of the rainbow, just as that in a color television picture.

These days, high-intensity color LEDs are showing up everywhere such as the traffic lights. The reasons for the rapid switchover are simple. Incandescent bulbs have to be replaced annually, but LED traffic lights should last five to yen years. LEDs also use 80 to 90 percent less electricity than the conventional signals they replace. Collectively, the new traffic lights save at least 400 million kilowatt-hours a year in the United States.

Much bigger savings await if LEDs can supplant Mr. Edison's bulb at the office and in the living room. Creating a white-light LED that is energy-saving, cheap and appealing has proved a tough engineering challenge. But all the major lightbulb makers--including General Electric, Philips, and Osram-Sylvania -- are teaming up with semiconductor manufacturers to make it happen.

From the first paragraph, we can see that Dave Irvine-Halliday______.

A．is a mountain climber

B．went to that village to repair the lamps

C．found the villagers were using the lamps he had given them

D．has visited the small village several times

第三篇 Eat Healthy

"Clean your plate! " and "Be a member of the clean-plateclub! " Just about every kid in the UShas heard this from a parent orgrandparent. Often, it's accompanied by an appeal: "Just think aboutthosestarving orphans in Africa!" Sure, weshould be grateful for every bite of food. Unfortunately,many people in theUStake toomany bites. Instead of staying "clean the plate", perhaps weshouldsave some food for tomorrow.

According to news reports, US restaurants are partly to blame for thegrowing beUies. A waiterputs a plate of food in front of each customer, withtwo to four times the amount recomme.nded by thegovernment, according to a USAToday story. Americans traditionally associate quantity with valueand mostrestaurants try to give them that. They prefer to have customers complain abouttoo muchfood rather than too little.

BarbaraRolls, a nutrition professor at Pennsylvani'a State University, told USA Todaythat res-taurant portion sizes began to grow in the 1970s, the same time thatthe American waistline began toexpand.

Healthexperts have tried to get many restaurants to serve smaller portions. Now,apparently, some cus-tomers are calling for this too. The restaurant industrytrade magazine QSR reported last month that 57 per-cent of more than 4, 000people surveyed beljeve restaurants serve portions that are too large; 23percent had no opinion; 20 percent disagreed. But a closer look at the surveyindicates that many Americans who can't af-ford fine dining still prefer largeportions. 70 percent of those earning at least $ 150, 000 per year prefersmal-ler portions; but only 45 percent of those earning less than $ 25, 000want smaller.

It'snot that working class Americans don't want to eat healthy. It's just that,"after long hours at low-paying jobs, getting less on their plate hardlyseems like a good deal. They live from paycheck topaycheck, happy to save alittle money for next year's Christmas presents.

Parents in theUnited Statestend to ask their children

A.not to waste food at meals

B.to save food for tomorrow

C.to wash the dishes clean

D. not to eat too much at meals

Eat Healthy

“Clean your plate!” and “Be a member of the clean plate club!” Just about every kid in the US has heard this from a parent or grandparent. Often, it’s accompanied by an appeal: “Just think about those starving orphans in Africa!” Sure, we should be grateful for every bite of food. Unfortunately, many people in the US take too many bites. Instead of staying “clean the plate”, perhaps we should save some food for tomorrow.

According to news reports, US restaurants are partly to blame for the growing bellies. A waiter puts a plate of food in front of each customer, with two to four times the amount recommended by the government, according to a USA Today story. Americans traditionally associate quantity with value and most restaurants try to give them that. They prefer to have customers complain about too much food rather than too little.

Barbara Rolls, a nutrition professor at Pennsylvania State University, told USA Today that restaurant portion sizes began to grow in the 1970s, the same time that the American waistline began to expand.

Health experts have tried to get many restaurants to serve smaller portions. Now, apparently, some customers are calling for this, too. The restaurant industry trade magazine QSR reported last month that 57 percent of more than 4,000 people surveyed believe restaurants serve ‘portions that are too large; 23 percent had no opinion; 20 percent disagreed. But a closer look at the survey indicates that many Americans who can’t afford fine dining still prefer large portions. 70 percent of those earning at least $150,000 per year prefer smaller portions; but only 45 percent of those earning less than $ 25,000 want smaller.

It’s not that working class Americans don’t want to eat healthy. It’s just that, after long hours at low-paying jobs, getting less on their plate hardly seems like a good deal. They live from paycheck to paycheck, happy to save a little money for next year’s Christmas presents.

Parents in the United States tend to ask their children

A．to save food.

B．to wash the dishes.

C．not to waste food.

D．not to eat too much.

Eat Healthy

"Clean your plate!" and "Be a member of the clean-plate club!" Just about every kid in the US has heard this from a parent or grandparent. Often, it's accompanied by an appeal: "Just think about those starving orphans in Africa!" Sure, we should be grateful for every bite of food. Unfortunately, many people in the US take too many bites. Instead of staying "clean the plate", perhaps we should save some food for tomorrow.

According to news reports, US restaurants are partly to blame for the growing bellies. A waiter puts a plate of food in front of each customer, with two to four times the amount recommended by the government, according to a USA Today story. Americans traditionally associate quantity with value and most restaurants try to give them that. They prefer to have customers complain about too much food rather than too little.

Barbara Rolls, a nutrition professor at Pennsylvania State University, told USA Today that restaurant portion sizes began to grow in the 1970s, the same time that the American waistline began to expand.

Health experts have tried to get many restaurants to serve smaller portions. Now, apparently, some customers are calling for this, too. The restaurant industry trade magazine QSR "reported last month that 57 percent of more than 4,000 people surveyed believe restaurants serve portions that are too large; 23 percent had no opinion; 20 percent disagreed. But a closer look at the survey indicates that many Americans who can't afford fine dining still prefer large-portions. 70 percent of those earning at least $150,000 per year prefer smaller portions; but only 45 percent of those earning less than $ 25,000 want smaller.

It's not that working class Americans don't want to eat healthy. It's just that, after long hours at low-paying jobs, getting less on their plate hardly seems like a good deal. They live from paycheck to paycheck, happy to save a little money for next year's Christmas presents.

Parents in the United States tend to ask their children______.

A．to save food.

B．to wash the dishes.

C．not to waste food.

D．not to eat too much.