To evaluate the conductivity of a material, the only micro factor is carrier mobility.

The other distinguishing trait of the law is ______ .

A．punishment is carried out by the courts at all levels

B．rules and court practices initiated by a governmental agency are specifically designed to increase government control

C．a system of rules governing a conduct, activity or event incidental by nature

D．any governmental reinforcement

The other distinguishing trait of the law is ______.

A．punishment is carried out by the courts at all levels

B．rules and court practices initiated by a governmental agency, are specifically designed to increase government control

C．asystem of rules governing a conduct, activity or event incidental by nature

D．any governmental reinforcement

The other distinguishing trait of the law is ______.

A．punishment is carried out by the courts at all levels

B．rules and court practices initiated by a governmental agency are specifically designed to increase government control

C．a system of rules governing a conduct, activity or event incidental by nature

D．any governmental reinforcement

The other distinguishing trait of the law is ______.

A．punishment is carried out by the courts at all levels

B．rules and court practices initiated by a governmental agency, are specifically designed to increase government control

C．asystem of rules governing a conduct, activity or event incidental by nature

D．any governmental reinforcement

Her study is carried out _____ the basis of theses theories.

A、in

B、with

C、by

D、on

听力原文： Hidden passengers traveling in ships, trains, or even cars can be a terrible nuisance, especially when they are insects. In this respect, there is a great difference between human 'beings and insects. The former make every possible effort to avoid discovery, while the latter quickly draw attention to themselves.

We can only sympathize with the unfortunate man who had to stop his car soon after setting out from a country village to drive to London. Hearing a strange noise from the back of the car, he naturally got out to have a look. He examined the wheels carefully but as he found nothing wrong, he continued on his way. The noise began almost immediately and now it was louder than ever. Quickly turning his head, the man saw what appeared to be a great black cloud following the car. When he stopped at a village further on, he was told that a queen bee must be hidden in his car as there were thousands of bees nearby.

On learning this, the man realized that the only way to escape would be to drive away as quickly as possible. After an hour's hard driving, he arrived in London where he parked his car outside a hotel and went in to have a drink. It was not long before a customer who had seen him arrive hurried in to inform. him that his car was covered with bees. The poor motorist telephoned the police and explained what had happened. The police decided that the best way to deal with the situation would be to call a bee-keeper. In a short time, the bee-keeper arrived. He found the unwelcome passenger hidden near the wheels at the back of the car. Very grateful to the motorist for his unexpected gift, the keeper took the queen and her thousands of followers home in a large box. Equally grateful, file motorist drove away in peace, at last free from the "black cloud" which had hung over his car.

(30)

A．A big noise.

B．A strange noise.

C．A stranger's noise.

D．A child's noise.

听力原文： Hidden passengers traveling in ships, trains, or even cars can be a terrible nuisance, especially when they are insects. In this respect, there is a great difference between human 'beings and insects. The former make every possible effort to avoid discovery, while the latter quickly draw attention to themselves.

We can only sympathize with the unfortunate man who had to stop his car soon after setting out from a country village to drive to London. Hearing a strange noise from the back of the car, he naturally got out to have a look. He examined the wheels carefully but as he found nothing wrong, he continued on his way. The noise began almost immediately and now it was louder than ever. Quickly turning his head, the man saw what appeared to be a great black cloud following the car. When he stopped at a village further on, he was told that a queen bee must be hidden in his car as there were thousands of bees nearby.

On learning this, the man realized that the only way to escape would be to drive away as quickly as possible. After an hour's hard driving, he arrived in London where he parked his car outside a hotel and went in to have a drink. It was not long before a customer who had seen him arrive hurried in to inform. him that his car was covered with bees. The poor motorist telephoned the police and explained what had happened. The police decided that the best way to deal with the situation would be to call a bee-keeper. In a short time, the bee-keeper arrived. He found the unwelcome passenger hidden near the wheels at the back of the car. Very grateful to the motorist for his unexpected gift, the keeper took the queen and her thousands of followers home in a large box. Equally grateful, file motorist drove away in peace, at last free from the "black cloud" which had hung over his car.

(30)

A．A big noise.

B．A strange noise.

C．A stranger's noise.

D．A child's noise.

听力原文： Hidden passengers traveling in ships, trains, or even cars can be a terrible nuisance, especially when they are insects, in this respect, there is a great difference between human beings and insects, The former make every possible effort to avoid discovery, while the latter quickly draw attention to themselves.

We can only sympathize with the unfortunate man who had to stop his car soon after setting out from a country village to drive to London. Hearing a strange noise from the back of the ear. he naturally got out to have a look. He examined the wheels carefully but as he found nothing wrong, he continued on his way. The noise began almost immediately and now it was louder than ever. Quickly turning his head, the man saw what appeared to be a great black cloud following the car. When be stopped at a village further on, he was told that a queen bee must be hidden in his car as there were thousands of bees nearby.

On learning this, the man realized that the only way to escape would be to drive away as quickly as possible. After an hour's hard driving, he arrived in London where he parked his car outside a hotel and went in to have a drink. It was not long before a customer who had seen him arrive hurried in to inform. him that his car was covered with bees. The poor motorist telephoned the police and explained what had happened. The police decided that the best way to deal with the situation would be to call a bee-keeper. In a short time, the bee-keeper arrived. He found the unwelcome passenger hidden near the wheels at the back of the car. Very grateful to the motorist for his unexpected gift, the keeper took the queen and her thousands of followers home in a large box. Equally grateful the motorist drove away in peace, at last flee from the "black cloud" which had hung over his car.

(30)

A．A big noise.

B．A strange noise.

C．A stranger's noise.

D．A child's noise.

● As a project is carried out and slack time is consumed on individual tasks, the slack left over for the remaining tasks is:

A Insignificant.

B Reduced.

C Unchanged.

D Increased.

E Doubled.

Astronaut Jim Voss has enjoyed many memorable moments in his career, including three space flights and one space walk. But he recalls with special fondness a decidedly earthbound experience in the summer of 1980, when he participated in the NASA-AS-EE Summer Faculty Fellowship Program. Voss, then a science teacher at West Point, was assigned to the Marshall Space Flight Center's propulsion lab in Alabama to analyze why a hydraulic fuel pump seal on the space shuttle was working so well when previous seals had failed. It was a seemingly tiny problem among the vast complexities of running the space program. Yet it was important to NASA because any crack in the seals could have led to destructive results for the astronauts who relied on them.

"I worked a bit with NASA engineers," says Voss, "but I did it mostly by analysis. I used a handheld calculator, not a computer, to do a thermodynamic analysis. "At the end of the summer, he, like the other NASA-ASEE fellows working at Marshall, summarized his findings in a formal presentation and detailed paper. It was a valuable moment for Voss because the ASEE program gave him added understanding of NASA, deepened his desire to fly in space, and intensified his application for astronaut status.

It was not an easy process. Voss was actually passed over when he first applied for the astronaut program in 1978. Over the next nine years he reapplied repeatedly, and was finally accepted in 1987. Since then he has participated in three space missions. The 50-year-old Army officer, who lives in Houston, is now in training for a four-month mission as a crew member on the International Space Station starting in July 2000.

Voss says the ASEE program is wonderful for all involved. "It brings in people from the academic world and gives NASA a special property for a particular period of time. It brings some fresh eyes and fresh ideas to NASA, and establishes link with our colleges and universities," Voss explains. "There's an exchange of information and an exchange of perspectives that is very important."

For the academic side, Voss says, the ASEE program also "brings institutions of higher learning more insight into new technology. We give them an opportunity to work on real-world problems and take it back to the classroom. "

Why was the hydraulic fuel pump seal important for the space shuttle?

A．Because previous seals all failed.

B．Because it was very complex in running the space program.

C．Because great care has to be taken of the hydraulic fuel pump sealing.

D．Because any crack in the seals would cause disastrous results for the astronauts.