首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、Insects are the most adaptable creatures. B、Insects would be out of control if nothing were done. C、Insects will some day devo
A、Insects are the most adaptable creatures. B、Insects would be out of control if nothing were done. C、Insects will some day devo
admin
2010-09-25
31
问题
(32)Scientists have discovered that plants themselves produce many poisonous chemicals for defense against insects. But insects have developed ways of dealing with them. Guess how many years have the insects been eating plants. The number itself will scare you. (33) In fact, insects have been eating plants for as many as 250 million years. Now insects are using these same mechanisms to deal with man-made poisons—insecticides. This is why resistance of insects to insecticides has developed so rapidly.
What should be done? Scientists studying the problem suggest (34) that farmers use less insecticides. At the moment, farmers (34)regularly spray crops as a precaution against problems that are caused by large numbers of pests. They should, instead, spray only where pests have actually been seen. Secondly, (34)farmers could use a combination of two or three insecticides at once. To survive, the insects would need to become resistant to two or more insecticides at the same time.
The most surprising suggestion, perhaps, is that at certain times of the year, farmers should actually try to attract new insects onto the crops they are trying to protect. The new insects will mate with those which survived from a certain kind of insecticide and will lessen the latter’s resistance to it.
(35) Scientists hope that these and other measures will postpone the day when farmers and scientists will have to stand by while new super-bugs which may be resistant to all poisons invade our farms and devour our crops.
选项
A、Insects are the most adaptable creatures.
B、Insects would be out of control if nothing were done.
C、Insects will some day devour all plants on the Earth.
D、Insects have developed resistance to both botanical and artificial poison rapidly.
答案
D
解析
科学家希望义中提到的措施可以延缓庄稼面临新型的肆虐虫灾的侵害:Scientist hope that these and other measures will postpone...our farms and devour our crops. 可见昆虫对生态的杀虫剂和人工杀虫剂的抵抗力都是增长得十分迅猛的。故正确答案为D。
转载请注明原文地址:https://kaotiyun.com/show/rUz7777K
0
大学英语六级
相关试题推荐
A、Peopleinthecountrysidehavetoworkhardertomakealiving~B、Thenationalsocialandeconomicprogresswillbehindered.
Throughouthistory,peoplewithdisabilitieshaveoftenbeensubjectedtocreelandinhumantreatment.Forexample,intheearly
WhetherChina’shousingreformcanbecarriedonsuccessfullywillhave【S1】______aprofoundbearingonthefutureofther
WhetherChina’shousingreformcanbecarriedonsuccessfullywillhave【S1】______aprofoundbearingonthefutureofther
A、Theyarenotasdangerousaspeoplethink.B、Theycanbeasfriendlytohumansasdogs.C、Theyattackhumanbeingsbynature.
Childrenbelieveparents,andtheyseldom_______________(怀疑父母说的话和做的事是错的).
Allresidentsmustobeythetrafficregulations;high-rankingofficialsandforeigners_______________(均不例外).
FactsaboutDepressionInanygivenone-yearperiod,9.5%ofthepopulation,orabout18.8millionAmericanadults,sufferf
FactsaboutDepressionInanygivenone-yearperiod,9.5%ofthepopulation,orabout18.8millionAmericanadults,sufferf
A、TolookatthehistoryofmoviesintheUnitedStates.B、Arrangementforthemoviecourse.C、LookingatTheGoldDiggerof193
随机试题
Whenyoungpeoplegettheirfirstrealjobs,theyfacealotofnew,confusingsituations.Theymayfindthateverythingisdiff
A.脑干网状结构B.视前区-下丘脑前部C.下丘脑视交叉上核D.下丘脑冷敏神经元较多分布于
体现“人营犹可透热转气”理论的方剂是( )
急性溶血性贫血,黄疽,Coombs试验(+)慢性溶血性贫血,黄疸,脾大,红细胞渗透脆性试验(+)
下列关于法律价值的表述成立的有:
某企业因技术改造,资金周转困难,需要向银行贷款8000万元,公司总经理找来财务主管王某,说:“现在公司资金紧张,急需向银行贷款,提供给银行的会计报表一定要漂亮一点,请你负责技术处理一下。”王某开始感到很为难,认为做这种“技术”处理是很危险的。在总经理的反
下列说法中错误的是()。
A公司有关固定资产核算业务如下:(1)2009年1月1日A公司从C公司购入—台机器设备作为生产车间固定资产使用,该机器总价款为3000万元,购货合同约定,款项分3年支付,2009年12月31日支付1500万元,2010年12月31日支付900万元,201
在国外,很多遗传、传染类疾病属于公民隐私范畴,而在我国,有些机构随意披露公民这些隐私的现象还相当普遍,法律对此还缺乏相关的规定和有效的保护,导致公民在这些隐私被披露后无法获得司法救济。通过这段话,作者想表达的是()。
YouwillhearaninterviewwithTomEdisonaboutU.S.technologyformation.Foreachquestion(23-30),markoneletter(A,Bo
最新回复
(
0
)