问题 单项选择题

流行病学实验研究中,实验组与对照组人群的最大不同是

A.年龄不同
B.性别不同
C.目标人群不同
D.干预措施不同
E.观察指标不同

答案

参考答案:D

解析:流行病学实验研究中,实验组与对照组除了干预措施不同以外,其余各项特征基本帼似,即两组具有可比性。

阅读理解

阅读理解。

     When you want to go shopping, decide how much money you can spend for new clothes. Think about

the kind of clothes you really need. Then look for those clothes on sale (销售).

     There are labels (标签) inside all new clothes. The labels tell you how to take care of your clothes. The

label for a shirt may tell you to wash it in warm water. A sweater label may tell you to wash by washing in

cold water. The label on a coat may say "dry clean only." Washing may ruin (损坏) this coat. If you do as

the directions (说明) say on the label, you can keep your clothes looking their best. Many clothes today must

be dry cleaned. Dry cleaning is expensive. When buying new clothes, check (核实) to see if they will need

to be dry cleaned. You will save money if you buy clothes that can be washed.

     You can save money if you buy clothes that are well made. Well-made clothes last longer. They look good

even after they have been washed many times. Clothes that cost more money are not always better made.

They do not always fit (合身) better. Sometimes less expensive clothes look and fit better than more expensive

clothes.

1. If you want to save money you can buy clothes that ________.

A. don't fit you

B. don't last long

C. need to be dry cleaned

D. can be washed

2. The label inside the clothes tells you ________.

A. how to keep them looking their best

B. how to save money

C. whether they fit you or not

D. where to get them dry cleaned

3. The first thing for you to do before you buy clothes is ________.

A. to look for well-made clothes

B. to see how much money you can pay

C. to know how to wash them

D. to read the labels inside them

4. We learn from the reading that cheaper clothes ________.

A. are always worse made

B. must be dry cleaned

C. can not be washed

D. can sometimes fit you better

5. The best title (标题) for the reading should be ________.

A. Buying Less Expensive Clothes

B. Taking Enough Money When Shopping

C. Being a Clever Clothes Shopper

D. Choosing the Labels inside New Clothes

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