问题 单项选择题

一个人从饮食中摄入的胆固醇和脂肪越多,他的血清胆固醇指标就越高。存在着一个界限,在这个界限内,二者成正比。超过了这个界限,即使摄入的胆固醇和脂肪急剧增加,血清胆固醇指标也只会缓慢地有所提高。这个界限,对于各个人种是一样的,大约是欧洲人均胆固醇和脂肪摄入量的1/4。上述断定最能支持以下哪项结论______

A.中国的人均胆固醇和脂肪摄入量是欧洲的1/2,但中国的人均血清胆固醇指标不一定等于欧洲人的1/2
B.上述界限可以通过减少胆固醇和脂肪的摄入量得到降低
C.3/4的欧洲人的血清胆固醇含量超出正常指标
D.如果把胆固醇和脂肪的摄入量控制在上述界限内,就能确保血清胆固醇指标的正常

答案

参考答案:A

解析:如果一个人摄入的胆固醇及脂肪和他的血清胆固醇指标无条件成正比,那么,如果中国的人均胆固醇和脂肪摄入量是欧洲的1/2,则其人均血清胆固醇指标也等于欧洲人的1/2。但题干断定,以欧洲人均胆固醇和脂肪摄入量的1/4为界限,在该界限内,上述二者成正比;超过这个界限,则不成正比。因此,可以得出结论:中国的人均胆固醇和脂肪摄入量是欧洲的1/2,但中国的人均血清胆固醇指标不一定等于欧洲人的1/2,即A项成立。

阅读理解

All students need to have good study habits. When you have good study habits, you will learn things quickly and also remember them easily. Do you like to study in the living room? This is not a good place, because it is usually too noisy. You need to study in a quiet place, like your bedroom A quiet place will help you only to think about one thing. When you study, do not think about other things at the same time. Only think about your homework. If you do so, you will do your homework more quickly, and you will make fewer mistakes.

Good study habits are very important. If you do not have them, try to learn them. If your study

habitsare already good. Try to make them better.

小题1:If you have good study habits, you can__________.

A.learn things quickly and remember them easily

B.do things quickly and remember them easily

C.read books quickly but forget them easily

D.write words quickly but forget them easily小题2:You need_______ when you study.

A.a dining room

B.a quiet place

C.a living room

D.a noisy place小题3:When you study, you should think about________.

A.good study habits

B.other things

C.your homework

D.your hobbies小题4:After reading this passage, we know that good study habits are very_______.

A.difficult

B.unusual

C.important

D.easy小题5:According to (根据) the writer, which can be a good study habit?

A.Reading English among a crowd of people.

B.Thinking only about math in a math class.

C.Thinking in Chinese while talking in English.

D.Do your homework as quickly as you can.

单项选择题