Question

　　阅读理解。阅读下列短文，从每题所给的选项中，选出最佳答案。

　　Millions of years ago, whales lived on land and walked on four legs. Today whales still have small bones, which can only be seen on the inside of them. No one knows why whales left the land to live in the water. However, scientists can imagine when the whales changed their living conditions, their bodies underwent a change----showing a more fish----like appearance. This new form offered less resistance to the water. And the whales could swim faster.　　Whales are not fish. A whale will die, just as a man will, if it stays under water too long. When a whale is under water it closes its nose and holds is breath. The air in its lungs becomes very hot and its lungs are full of water vapour. A whale rises to the surface and breathes, its hot breath produces a fountain of water that rises high in the air. A man produces the same effect when he breathes warm air on a cold morning.

1．Today there are small bones on the inside of whales, which shows that ________.

[　　]

A．whales are fish

B．whales once lived on land

C．whales lived in the water millions of years ago

D．whales can live on land today

2．What happened to whales when they changed their living conditions?

[　　]

A．They began to leave water.

B．They began to live on land.

C．Their bodies began to change and looked like fish.

D．They changed into fish.

3．Whales can swim faster, because ________.

[　　]

A．they have smaller bones

B．their bodies have less resistance to the water

C．they often practise swimming

D．they seldom live on land

4．The word in the first paragraph “underwent” means

[　　]

A．passed through

B．brought about

C．took place

D．depended on

5．When a whale rises to the surface of the water and breathe, ________.

[　　]

A．it begins to take in warm air

B．the air in its lungs becomes very hot

C．its hot breath rises high in the air

D．the air in its lungs is changed into water vapour

Answer 1

答案：B;C;B;A;C