问题 填空题

如图1,梅花绽放的时候,距离梅花很远的地方就能闻到花的香味,这种现象说明了______;夏天,如图2,雨后天晴,荷叶上的水珠随荷叶拂动而滚动不止,当两滴水珠相遇时,会汇合变成一滴较大的水滴,这说明:______.

答案

(1)梅花绽放的时候,距离梅花很远的地方就能闻到花的香味,梅花的芳香分子扩散到空气中,这种现象说明了分子在不停的做无规则的运动;

(2)雨后天晴,荷叶上的水珠随荷叶拂动而滚动不止,当两滴水珠相遇时,会汇合变成一滴较大的水滴,这说明:分子之间存在引力.

故答案为:分子在不停的做无规则的运动;分子间存在引力.

阅读理解

阅读短文,选择正确答案。

      Some people think that all wild animals are dangerous. In fact, few of them will eat a man if left alone. If

you meet a lion, I am sure you will run away. But even a lion will avoid (避免) a man if it is not very hungry.

Lions only kill and eat men when they have grown too old to catch their food, such as sheep and other animals.

Some animals get frightened when they only smell a man. Some of them stand and look at a man for a little while

before they run away. Others take no notice at all but quietly walk in another direction (方向). Wild animals only

eat a man when they are afraid that he tries to kill their young ones, or when they are shot at and made angry.

1. If you meet a lion which is not very hungry, ______. [ ]

A: it will become your friend quickly

B: it will try to catch you

C: it will leave you

D: you must shoot it

2. Very old wild animals are dangerous to men because ______. [ ]

A: they like to eat men

B: they can't avoid men

C: they can't catch other small animals

D: they are too old to catch men

3. Wild animals usually kill and eat _____. [ ]

A: sheep and other small animals

B: moving lions

C: humans

D: only women and children

4. Wild animals will catch and eat a man if he ______. [ ]

A: tries to run away

B: makes them angry

C: doesn't kill their young ones

D: leaves them alone

5. In the writer's eyes _______. [ ]

A: wild animals are always dangerous

B: young wild animals are dangerous

C: wild animals only eat sheep

D: wild animals are not always dangerous

问答题 简答题