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The 3rd, 6th, 9th maxima are missing in a grating experiment, and the grating constant d=7200nm. What is the minimum possible value of slit width a? a = ________nm

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第1题

What is the purpose of the experiment in the bookstore?

A.To see which promotion method is preferred by customers.

B.To find out the strengths and weaknesses of both methods.

C.To try to set up a new retailer-customer relationship.

D.To see the effect of an approach on customers" decisions.

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第2题

Lowering the Risk of Heart Disease

Like millions of other Americans, I come from a family with a history Of heart disease. My father had his first three heart attacks when he was only thirty-one.__________(46)I grew up with heart disease. It was there, but I didn't take it seriously.

When I was thirty-one, my blood cholesterol (胆固醇) level was measured for the first time. It was 311 mg/dl, the doctor told me--an extremely high level that put me at a very high risk of heart disease, 'especially with my family history. He sent me to the National Institutes of Health (NIH) to be screened for participation in a clinical trial. _________(47)

At NIH, physicians explained the degree of risk associated with my blood

cholesterol level and the nature of the experiment. This test involves putting a tube through a leg artery (动脉) up to the heart._________(48)

Learning about the risks of the experiment as well as the risk associated with my raised blood cholesterol level scared the life out of me. Although I was excluded from participating in the study, the experience may well have saved my life.

For the first time, I began to realize the seriousness of high blood cholesterol.___________(49) But equally important, I got a taste of what it is like to be a patient, to have tests done on me and to think of myself as sick. This was hard to take.

This experience taught me two lifesaving lessons. First, although I felt fit and strong, I was actually at high risk for heart disease because of my high blood cholesterol level. And with my family history, it could not be ignored.___________(50)

A.The death rate for the test was only 1 in 100, I was assured.

B.Second, I could lower my blood cholesterol level simply by changing what I ate.

C.I was three years old at that time.

D.There is not enough oxygen in the blood.

E. It was a heart attack just waiting to happen.

F. The trial was designed to test the effect of lowering blood cholesterol on the risk of heart disease.

第 46 题 请选择(46)处的最佳答案.

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第3题

第5部分:补全短文(第46-50题,每题2分,共10分) 阅读下面的短文,文章中有5处空白,文章后面有6组文字,请根据文章的内容选择5组文字,将其分别放回文章原有位置,以恢复文章原貌。请将答案涂在答题卡相应位置上。

Lowering the Risk of Heart Disease

Like millions of other Americans, I come from a family with a histotry of the heart disease. My father had his first three heart attacks when he was only thirty-one. _____________(46) I grew up with heart disease. It was there, but I didn’t take it seriouly.

When I was thirty-one, my blood cholesterol(胆固醇)level was measured for the first time.It was 311 mg/dl, the doctor told me- an extremely high level that put me at a very high high risk of heart disease, especially with my family history. He sent me to the National Institutes of Health(NIH)to be screened for participation in a clinical trial._____________(47)

At NIH, physicians explained the degree of risk associated with my blood cholesterol level and the nature of the experiment. This test involves putting a tube through a leg artery(动脉) up to the heart._____________(48)

Learning about the risks of the experiment as well sa the risk associated with my raised blood cholesterol level scared the life out of me. Although I was excluded from participating in the study, the experience may well have saved my life.

For the first time, I began to realize the seriousness of high blood cholesterol.___________(49) But equally important, I got a taste of what it is like to be a patient, to have tests done on me and to think of myself as sick.This was hard to take.

This experience taught me two lifesaving lessons. First, although I felt fit and strong, I was actually at high risk for heart disease because of my high blood cholesterol level. And with my family histaory, it could not be ignored.________________(50)

A Second, I could lower my blood cholesterol level simply by changing what I ate.

B I was three years old at that time.

C There is not enough oxygen in the blood.

D It was a heart attack just waiting to happen

E The trial was designed to test the effect of lowering blood cholesterol on the risk of heart disease.

F The death rate for the test was only 1 in 100, I was assured.

第46题:请选择(46)处最佳答案。

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第4题

Breakfast

1 If you have to miss one meal a day (or if you want to do so), which meal will cause you fewest health problems if you don't eat it? If they have to make a decision of this type, most people (especially dieters or very busy people) will choose to skip breakfast

2 However, many experts in the field of health consider breakfast (the meal which "breaks" your "fast" which started the night before) to be the most important meal of the day. If we eat a good breakfast, they say, we will have the energy and nutrients we need to begin our working day with vigor and hopefully with good humor. Nevertheless, many people skip breakfast or substitute a donut and a cup of coffee for a well-balanced meal What happens if we ignore the importance of breakfast?

3 One recent study conducted in the United States tesled a large number of people Participants included both males and females who ranged in age from 12 to 83. During the experiment, these people were given a variety of breakfast, and sometimes, they had to skip breakfast completely. Special tests, including blood tests and endurance tests, were setup to analyze how well the participants, bodies functioned when they had eaten a certain kind of breakfast.

4 The results showed that if a person eats an adequate breakfast. he or she will work more efficiently and more productively than if he or she skips breakfast or eats a very poor breakfast. This fact appears to be especially true if a persofl,s work involves mental activity The study showed that if schoolchildren eat fruit, eggs, bread, and milk before going to school, they will learn more quickly and will be able to concentrate on their lessons for a longer period of time than if their breakfast diet is inadequate

5 The study also showed that, contrary to what many people believe, if you skip breakfast, you will not lose weight. This is because people become so hungry if they skip breakfast that they eat so much for lunch and end up gaining weight instead of losing. So remember, if you are on a diet, skipping breakfast will not help you. You will probably lose more weight if you reduce your other meals

Questions 21-30 are based on Passage .

21. The word "dieters" means "those who restrict themselves to a special diet in order to control their weight"

22. In the word "breakfast", "fast" probably means "going without food"

23. Many experts in the field of health think that breakfast is most important in a

working day.

24. Some people will substitute a donut and a cup of coffee for a regular breakfast

25. Those participating in the experiment were all adults.

26. During the experiment, these people were given very good breakfast

27. Special tests were set up to analyze how the participants, bodies functioned when they had eaten particular breakfast

28. The results showed that if a efficiently eats a big breakfast, he or she will work

29.The study showed that if schoolchildren have adequate breakfasts before going to school

30. We can safely say skipping breakfast will help one lose weight

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第5题

For a given characteristic in a construction process, the standard deviation associated with production variation is 0.8", and the standard deviation associated with measurement variation is 0.6". The total standard deviation for this characteristic is:

A . 1.4"

B . 1.2".

C . 1.0"

D . 0.8"

E . 0.2"

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