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
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上消化道出血来源包括()
A.食管
B.胃
C.十二指肠
D.空肠上段
E.胆道
适合传统模式,术后辅助放化疗的是()。
A.卵巢肿瘤
B.骨肉瘤
C.非霍奇金淋巴瘤
D.乳腺癌
E.肝细胞癌
高速混床进脂阀作用有()。
A、进树脂;
B、进气;
C、排水;
D、正洗进水。
采用电气除尘器来净化烟气,其除尘效率可达()。
A.90%以上
B.95%以上
C.98%以上
D.100%
患儿男,生后2天,出生体重为2400g。因吸入性肺炎入院,入院时患儿呼吸急促,口唇稍发绀。即置于辐射保暖床上抢救。
该患儿吸氧的流量应选择每分钟为()
A.1L
B.2L
C.3L
D.4L
E.5L