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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
64. The difference between spiders and insects is that _______ .
A. insects have only six leg’s B. insects only cat plants
C. spiders eat insects D. spiders have more legs than insects
65. 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. the quantity of different spiders in England was very big
D. that there were 6"000,000 kinds of spiders on a football field
66. In the last sentence the writer means _______ -
A. experts on spiders know exactly how much spiders eat in one year
B. experts on spiders can only make an estimation of the weight of insects eaten by spiders
C. authority on spiders know the weight of all the people in England
D. authority on spiders know both the weight of the insects eaten by spiders and the weight of people in England
67. Which one of the following statements is the main idea?
A. Spiders, the greatest insects-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.
(D)
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