天山-4-13

jenfzang

E，就算竞争不过，也不至于一口吃不上吧

Pudding

E，就算竞争不过，也不至于一口吃不上吧

這就是我對C / E confuse的地方...

同理: 就算不是actively的吃, 也不至於一口吃不上啊....

skyguard2000

我认为C中的actively不是积极的意思，而是主动的意思。C的意思是，在玉米释放花粉的时候，是否帝王蝶的小毛毛虫主动进食？如果它不是主动进食阶段，而是变成了蛹（化蝶的前一个阶段），那么小毛毛虫就不会食物中毒，进而花粉对小毛毛虫的死活就不造成影响。
E中说是否吃玉米的虫子和帝王蝶的小毛毛虫比赛吃牛奶草叶子，明显不合逻辑。

oookk

不太明白E为什么对的！？我下载的答案是E，但是我选C。

这个题目的结论是用那种变种过的玉米，会有危害蝴蝶的风险。

E说昆虫是否与蝴蝶幼虫竞争它的食物（leaves）。怎么合理法？题目说的是幼虫吃了那些含有变种过的玉米花粉的leaves会死的，然后题目上面的结论。这里主要讲花粉-leaves-蝴蝶之间的关系，怎么关insect的事啊？

选C的原因是：C说蝴蝶在那些玉米释放花粉时是否积极地繁殖。====因为，这些幼虫是要吃leaves的，而leaves中含花粉，而花粉有insecitide，那么吃了就会死了，如前提所说。如果幼虫繁殖了，那么吃了这些就会死，没繁殖就不会吃了。

不明白。。。。。！！斑竹，NN说说吗？？

remona9t

奇怪

我下载的答案怎么是C呢？

bobochen

请问：那结果是C还是E?

dongyuntao

A.Whether the natural insecticide is as effective against maize-eating insects as commercial insecticides typically used on maize are 回答是，说天然杀虫剂和人工喷洒的杀虫剂效力相当，但文中并没有谈到人工杀虫剂对毛虫有什么影响，所以不能起到加强作用。同理，回答否也没有削弱作用

B. Whether the pollen of genetically modified maize contains as much insectide as other parts of these plants无论回答是否，原文都没有提到玉米的其他部分所含有的天然杀虫剂对毛虫的影响，所以对评价原结论没有作用

C. Whether monarch butterfly caterpillars are actively feeding during the part of the growing season when maize is releasing pollen回答是，则玉米传播花粉－毛虫积极吃－会死很多，是加强。回答否，虽然花粉传播这种杀虫剂，但是这段时间毛虫不大进食，所以种植这种新型玉米就不会对毛虫产生危害了

D. Whether insects that feed on genetically modified maize plants are likely to be killed by insecticide from the plant’s pollen基本无关

E. Whether any maize-eating insects compete with monarch caterpillars for the

leaves of milkweed plants growing near maize fields回答是，说有虫子和毛虫竞争吃milkweed叶子，是外界因素，并不能直接说明结论中的maize对毛虫的影响是大是小。况且即使有虫子竞争，如果这种天然杀虫剂很厉害，毛虫吃了必死的话，那还是会对他们的养殖构成威胁的。

vacationer

Which of the following, if true, most seriously weakens the argument?

A.   er unit of volume, the natural insecticide produced by the genetically modified maize plants is less toxic to insects than are many commercial insecticides commonly used on maize plants.

B.    Standard weed-control practices that have been used by farmers for decades have largely eliminated milkweed plants from certain areas where monarch-butterfly caterpillars were once common.

C.   The experiments showed that the caterpillars were not harmed by contact with the pollen from the genetically modified plants unless they ingested it.

D.   The maize-eating insects that the natural insecticide protects against do not feed on the pollen of the maize plant.

E.    Airborne maize pollen tends to collect on the middle leaves of milkweed plants and monarch caterpillars feed only on the plant’s tender upper leaves.

为什么我下载的问题跟大家不一样?

illgetthere

以下是引用dongyuntao在2005-8-11 19:23:00的发言：

A.Whether the natural insecticide is as effective against maize-eating insects as commercial insecticides typically used on maize are 回答是，说天然杀虫剂和人工喷洒的杀虫剂效力相当，但文中并没有谈到人工杀虫剂对毛虫有什么影响，所以不能起到加强作用。同理，回答否也没有削弱作用

B. Whether the pollen of genetically modified maize contains as much insectide as other parts of these plants无论回答是否，原文都没有提到玉米的其他部分所含有的天然杀虫剂对毛虫的影响，所以对评价原结论没有作用

C. Whether monarch butterfly caterpillars are actively feeding during the part of the growing season when maize is releasing pollen回答是，则玉米传播花粉－毛虫积极吃－会死很多，是加强。回答否，虽然花粉传播这种杀虫剂，但是这段时间毛虫不大进食，所以种植这种新型玉米就不会对毛虫产生危害了

D. Whether insects that feed on genetically modified maize plants are likely to be killed by insecticide from the plant’s pollen基本无关

E. Whether any maize-eating insects compete with monarch caterpillars for the

leaves of milkweed plants growing near maize fields回答是，说有虫子和毛虫竞争吃milkweed叶子，是外界因素，并不能直接说明结论中的maize对毛虫的影响是大是小。况且即使有虫子竞争，如果这种天然杀虫剂很厉害，毛虫吃了必死的话，那还是会对他们的养殖构成威胁的。

totally agree

vancouverade

E项中就算有虫子同他竞争，也同样会对它带来危险啊，只是程度大小而已