問題詳情：
Why you may wonder，should spiders（蜘蛛）be our friends? Because they destroy so many insects（昆蟲），and insects include some of the greatest enemies of the human race．Insects would make it impossible for us to live in the world；they would devour all our crops and kill our animals，if it were not for the protection we get from insect-eating animals．We should thank the birds and insect-eating animals．We owe a lot to the birds and beasts who eat insects，but all of them put together kill an only small part of the number destroyed by spiders．Unlike some of the other insect eaters spiders never do the least harm to us or our belongings．
Spiders are not insects，as many people think，nor even nearly related to them．One can tell the difference almost at a glance for a spider always has eight legs and an insect has never more than six．
How many spiders engaged in the work on our behalf? One authority on spiders made a research of the spiders and found that there were more than 2，25000 in one acre；that is something like 6，000，000 spiders of different kinds on one football field．Spiders are busy for at least half the year in killing insects．It is impossible to make more than the wildest guess at how many they kill，but they are hungry creatures，not content with only three meals a day．It has been estimated that the weight of all the insects destroyed by spiders in Britain in one year would be greater than the total weight of all the human beings in that country．
（ ）1．Spiders should be our friends，because __________．
A．they only eat harmful insects
B．they are great insect-eating animals
C．they destroy large numbers of insects which do harm to the human race
D．their harmfulness is the least
（ ）2．The underlined word “devour” means ________ in Chinese．
A．淹沒 B．吞滅 C．侵入 D．踩踏
（ ）3．The difference between spiders and insects is that ____________．
A．insects have only six legs B．insects only eat plants
C．spiders eat insects D．spiders have more legs than insects
（ ）4．One authority on spiders estimated ________．
A．that there were more than 2，250，000 insects in a grass field in the south of
England
B．that every football field in England had 6，000，000 spiders
C．that the number of different spiders in England was very big
D．that there were 6，000，000 kinds of spiders on a football field
（ ）5．Which one of the following statements is the main idea?
A．Spiders，the greatest insect-eating animals，protect us from being destroyed by
harmful insects and they should be our friends．
B．Spiders are not insects but in fact animals．
C．There are great numbers of spiders engaged in destroying harmful insects on
behalf of the human race．
D．The weight of the insects eaten by spiders in one year is greater than the weight
of all people in England．
【回答】
1C 2B 3D 4C 5A
知識點：日常生活類
題型：閲讀理解
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