Of all living creatures on earth, insects are the most plentiful. Some 1 are very useful to man, for example, bees, 2 we get honey and wax, and silkworms, which 3 us with silk. Other varieties, 4 , are extremely harmful, and do a great 5 of damage, especially to crops. Locusts are perhaps the most dangerous of all, 6 they will eat almost any green 7 , and when millions of them 8 on cultivated land they soon leave it 9 . In some countries they are the farmers’ 10 enemy. Another nuisance is the common 11 , not only because it 12 us indoors and out-of-doors, but because it spreads diseases.

　　Scientists have given much time and 13 to the study of insects. It needs the most careful and 14 observation. Thanks 15 their discoveries we now know almost all 16 is to be known about the habits of these hardworking insects, bees and ants, which live in 17 better planned in some ways than our 18 . But the most valuable work has been done in trying to give 19 to men, animals and crops from the 20 which insects cause.

　　1. A. members B. forms C. qualities D. varieties

　　2. A. by which B. from which C. of which D. in which

　　3. A. give B. produce C. offer D. supply

　　4. A. however B. meanwhile C. offer D. supply

　　5. A. majority B. number C. amount D. what’s more

　　6. A. and B. for C. if D. when

　　7. A. grass B. field C. fruit D. plant

　　8. A. settle B. attack C. pass D. cross

　　9. A. bare B. nothing C. empty D. untouched

　　10. A. hardest B. greatest C. serious D. wildest

　　11. A. insect B. creature C. fly D. enemy

　　12. A. dislikes B. bites C. worries D. hates

　　13. A. understanding B. ideas C. comprehension D. thought

　　14. A. serious B. patient C. curious D. long

　　15. A. for B. of C. to D. with

　　16. A. that B. which C. there D. what

　　17. A. societies B. crowds C. teams D. organizations

　　18. A. world B. nation C. selves D. own

　　19. A. help B. protection C. living D. defense

　　20. A. injury B. wound C. sickness D. ruin

　　答案解析

　　1. D 下文提到other varieties are harmful，因此选D项，有些种类的昆虫。

　　2. B we get honey from bees, “从蜜蜂身上得到蜂蜜。”

　　3. D provide / supple sb. With sth. 表示“给某人提供/供应”，用C项则就该是offer sb. sth.。

　　4. A 在此表示上下文的转折关系，“但另一些种类有害”。

　　5. C a great / large amount of + 不可数名词，a large / small quaintly of + 可数/不可数名词表示“大量的”。

　　6. B 引导状语从句表原因，具体加以解释说明。

　　7. D plant概括性最强，包括grass等各种植物。

　　8. A settle用作不及物动词时，表示“停息、停留;安居、定居”等词义。

　　9. A 蝗虫飞过，耕地光秃秃的，植物都被吃了(当然有时可能留下光秃秃的枝干)。

　　10. B 此处意为“在有些国家他们是农民最大的敌人”。

　　11. C 下文提到在屋里屋外都有，还传播疾病，因此选C项。

　　12. C 苍蝇在屋里屋外飞，因扰我们。

　　13. D 花时间，想办法研究昆虫。Give much thought to表示“关心，想到”。

　　14. B 观察昆虫需要耐心，上文提到give much time to，因此此处也可说long-time observations。

　　15. C thanks to意为“幸亏，多亏”。

　　16. C 本题是all (that) there is to be done句式为there’s sth. To be done的结构变化形式。

　　17. A 既然与“我们的”相比较，其共同之处是society，人类社会和动物“群栖，群集”。

　　18. D our own (society)，“我们自己的社会形态”。

　　19. B 与下文的from相呼应，give sb. protection from “给……以保护”。

　　20. A 昆早给我们造成的伤害，此空从第4、5空所在句子的harmful, damage等词可推知选A项。