完形填空(共20小题,每小题1分.满分20分) 请认真阅读下面短文.从短文后各题所给的A.B.C.D四个选项中.选出最佳选项.并在答题卡上将该项涂黑. Most

完形填空（共20小题；每小题1分，满分20分）

请认真阅读下面短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。

Most people think of birds as feathered animals thatfly. Scientists,   36 , do not define (给…下定义) birds as animals thatfly, because some birds do not. Of the 10,000 or so species of birds, 46 cannot  37 . Flight plays a key role in   38  formost birds. It allows them to find food over a   39  areaand to get away from enemies. Ancestors of flightless birds may have   40  their ability to fly because they had no regular predators (捕食者) or did not need to fly to find food. Rather thanfly, some of these birds developed other   41  tocatch food and avoid enemies. Two examples of   42  birdsare penguins and ostriches.

  43  birds that fly, penguins do not have wide wingsor large feathers. In order to catch the fish they feed on, penguins use theirpowerful wings to swim   44 . And when they swim, they look as if they are flying through the water. The   45  ofpenguins’ bodies makes it possible for them to dive deep underwater,  46 their thick feathers protect them from the cold.

Ostriches are known for their long legs, long necks,and large size. To   47  themselves, they stay ingroups and use their excellent sight and hearing to   48  enemies.As soon as    49  approaches, they can run at aspeed of more than 65 kilometers per hour to   50  . Inaddition to using their strong legs to run, they can kick powerfully. 

Not all flightless birds have been   51  inprotecting themselves. Flightless birds on some islands had no enemies untilpeople   52 . These birds were hunted and easily caught bypeople and the animals   53  by people. Human landdevelopment has   54  the habitats of some birds. Anumber of flightless birds   55  because they wereunable to adapt to new conditions and new enemies.

1.                A．thus           B．however        C．therefore D．otherwise

2.                A．stand          B．fly             C．hear D．sing

3.                A．growth         B．communication   C．health    D．survival

4.                A．wide           B．familiar         C．crowded  D．special

5.                A．developed      B．improved       C．lost  D．proved

6.                A．parts           B．habits          C．ways D．tools

7.                A．wild           B．interesting      C．rare D．flightless

8.                A．Instead of       B．Because of      C．Besides   D．Unlike

9.                A．quickly         B．carefully        C．differently D．gradually

10.               A．shape          B．color           C．bone D．skin

11.               A．if             B．and            C．but   D．so

12.               A．help           B．feed           C．protect    D．hide

13.               A．kill            B．notice          C．confuse   D．frighten

14.               A．dawn          B．darkness        C．danger    D．food

15.               A．look           B．escape         C．move D．fight

16.               A．successful      B．natural         C．unusual   D．positive

17.               A．realized        B．acted          C．stopped   D．arrived

18.               A．brought        B．found          C．bought    D．hunted

19.               A．provided       B．formed         C．destroyed D．controlled

20.               A．flew away       B．watched out     C．gave away D．died out

试题答案

【答案】

1.B

2.B

3.D

4.A

5.C

6.C

7.D

8.D

9.A

10.A

11.B

12.C

13.B

14.C

15.B

16.A

17.D

18.A

19.C

20.D

【解析】

试题