问题 选择题

玛里亚那海沟是世界上最深的地方,请你想象一下,下列现象在那儿可能发生的是(  )

A.可以直接呼吸

B.可以将空金属盒压扁

C.舰艇外壳可以做得薄些

D.可以在水中自由游动

答案

液体压强跟液体的密度和深度有关.在液体密度一定时,液体越深,液体压强越大.

人在很深的海沟,海水很深,海水产生的压强很大,人受到很大的压强,在没有采取任何措施时,不能呼吸,不能在水中自由游动等.

空金属盒会被压扁,轮船的外壳比较薄也会被压扁.

故选B.

阅读理解

阅读理解。

      Your body, which has close relations with the food you eat, is the most important thing you own, so

it needs proper treatment and proper nourishment (食物). The old saying "an apple a day keeps the

doctor away." is not as silly as some people think. The body needs fruit and vegetables because they

contain vitamins. Many people take extra vitamins in pill form (丸剂), believing that these will make them

healthy. But a good diet is made up of nutritive food and this gives all the vitamins you need. The body

doesn't need or use extra vitamins, so why they waste money on them?

     In the modern Western world, many people are too busy to bother about eating properly. They throw

anyt hing into their stomachs, eating hurriedly and carelessly. The list of illnesses caused or made worse

by bad eating habits is frightening.

1. The old saying referred to in the passage tells us that        .

A. eating apples regularly does lots of good to our health.  

B. the apple is the best among all kinds of fruits  

C. apples can take the place of doctors

D. an apple is a sure cure for illness

2. In the second paragraph, the writer tries to let us know        .

A. our bodies need food, or we can't live  

B. often eating apples is a good habit  

C. taking extra vitamin pills is completely useless  

D. a good diet is of great importance for our health  

3. In the modern western countries        .

A. people won't want to pay more attention to their eating  

B. people throw everything into their stomachs without chewing.

C. list of people's illness are caused or made worse by bad eating habits

D. people are only too busy to cook meals for themselves  

4. From the passage we can draw a conclusion that if we want to keep healthy, we should        .

A. only eat an apple a day  

B. take as many vitamin pills as possible

C. eat properly    

D. throw something into our stomachs slowly and carefully.

问答题 简答题