Why, you may wonder, should spiders be our friends? Because they destroy so many insects, and insects __1__ some of the greatest enemies of the human race. Insects would make __2__ impossible for us to live in the world. They would devour (eat up quickly) all our crops and kill our flocks and herds, were it not __3__ the protection we get from insect-eating animals. We __4__ a lot to the birds and beasts who eat insects but all of them __5__ together kill only a fraction of the __6__ destroyed by spiders. __7__ , unlike some of the insect eaters, spiders never do the least __8__ to us or our belongings.
Spiders are not insects, __9__ many people think, __10__ even nearly related to them. One can tell the __11__ almost at a glance, __12__ a spider always has eight legs but an insect never more than six.
How many spiders are __13__ in this work on our __14__ ? One authority __15__ spiders made a __16__ of the spiders in a grass field in the south of England, and he estimated that there were more than 2 250 000 in one acre; that is __17__ like 6000 000 spiders of different kinds on a football field. Spiders are busy for at least half the year in killing insects. It is __18__ to make more than the __19__ guess at how many they kill, but they are hungry creature, not __20__ with only three meals a day.
1.[单选题]____- A.as
- B.which
- C.because
- D.though
3.[单选题]____- A. number
- B.amount
- C.plenty
- D.proportion
5.[单选题]____- A.broadest
- B.widest
- C.bravest
- D.wildest
6.[单选题]____- A.participated
- B.joined
- C.enclosed
- D.involved
8.[单选题]____- A.likely
- B.useless
- C.impossible
- D.probable
9.[单选题]____- A.Consequently
- B.Moreover
- C.Conversely
- D.However
11.[单选题]____- A.damage
- B.ruin
- C.good
- D.harm
12.[单选题]____- A.honor
- B.sake
- C.side
- D.behalf
13.[单选题]____- A.if
- B.although
- C.for
- D.when
14.[单选题]____- A.devote
- B.dedicate
- C.owe
- D.contribute
15.[单选题]____- A.gotten
- B.put
- C.linked
- D.associated
16.[单选题]____- A.concerned
- B.identified
- C.patient
- D.content
17.[单选题]____- A.include
- B.involve
- C.consist
- D.cover
18.[单选题]____- A.likeness
- B.difference
- C.similarity
- D.appearance
19.[单选题]____- A. census
- B.consensus
- C.conscience
- D.consciousness
20.[单选题]____- A.nothing
- B.something
- C.anything
- D.everything
参考答案: A,B,A,C,D,D,A,C,B,C,D,D,C,C,B,D,A,B,A,B