Of all living creatures on earth, insects are the most plentiful. Some 36 are very useful to man, for example, bees, 37 we get honey and wax, and silkworms, which 38 us with silk. Other varieties, 39 , are extremely harmful, and do a great 40 of damage, especially to crops. Locusts （蝗虫） are perhaps the most dangerous of all, 41 they will eat almost any green 42 , and when millions of them 43 on cultivated land（耕地）they soon leave it 44 . In some countries they are the farmer’s 45 enemy. Another nuisance is the common 46 , not only because it 47 us indoors and out - of- doors, but because it spreads diseases.
Scientists have given much time and 48 to the study of insects. It needs the most careful and 49 observation. Thanks 50 their discoveries we now know almost all 51 is to be known about the habits of these hardworking insects, bees and ants, which live in 52 better planned in some ways than our 53 . But the most valuable work has been done in trying to give 54 to men, animals and crops from the 55 which insects cause.
36．A. members B. forms C. qualities D. varieties
37．A. by which B. from which C. of which D. in which
38．A. give B. produce C. offer D. supply
39．A. however B. meanwhile C. therefore D. what's more
40．A. majority B. number C. amount D. quantity
41．A. and B. for C. if D. when
42．A. grass B. field C. fruit D. plant
43．A. settle B. attack C. pass D. cross
44．A. bare B. nothing C. empty D. untouched
45．A. hardest B. greatest C. serious D. wildest
46．A. insect B. creature C. fly D. enemy
47．A. dislikes B. bites C. worries D. hates
48．A. understanding B. ideas C. comprehension D. thought
49．A. serious B. patient C. curious D. long
50．A. for B. of C. to D. with
51．A. that B. which C. there D. what
52．A. societies B. crowds C. teams D. organizations
53．A. world B. nation C. selves D. own
54．A. help B. protection C. living D. defense
55．A. injury B. wound C. sickness D. ruin
36-40 DBDAC 41-45 BDAAB 46-50 CCDBC 51-55 CADBA
36．D 下文（第39空处）提到other varieties are harmful，因此选D，有些种类的昆虫。
37．B we get honey from bees，“从蜜蜂身上得到蜂蜜”。
38．D provide/supply sb．with sth．表示“给某人提供/供应”，用C则就该是offer sb．sth.
39．A 在此表示上下文的转折关系，“但另一些种类有害”。
40．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”。
41．B 引导状语从句表原因，具体加以解释说明。
42．D plant概括性最强，包括grass等各种植物。
43．A settle用作不及物动词时，表示“停息、停留；安居，定居”等词义。
44．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）。
45．B 农民最大的敌人。
46．C 下文提到在屋里屋外都有，还传播疾病，因此选C。
47．C 苍蝇在屋里屋外飞，困扰我们。
48．D 花时间，想办法研究昆虫。give much thought to表示“关心，想到”。
49．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．
50．C thanks to表示“幸亏/多亏有了”。
51．C 本小题是all（that）there is to be done句式为there's sth to be done（有事需要做）的结构变化形式。
52．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”。
53．D our own（society），“我们自己的社会形态”。
54．B 与下文的from相呼应，give sb．protection from，“给……以保护”。
55．A 昆虫给我们造成的伤害，此空从第39、40空所在句子的harmful，damage等词可推知选A。