[求助]大全-20-6

fifiliang

[求助]大全-20-6

    

大全-20-6.      Potato
cyst nematodes are a pest of potato crops. The nematodes can lie
dormant for several years in their cysts, which are protective
capsules, and do not emerge except in the presence of chemicals emitted
by potato roots. A company that has identified the relevant chemicals
is planning to market them to potato farmers to spread on their fields
when no potatoes are planted; any nematodes that emerge will soon
starve to death.

Which of the following, if true, best supports the claim that the company’s plan will be successful?

(A) Nematodes that have emerged from their cysts can be killed by ordinary pesticides.

(B) The only part of a potato plant that a nematode eats is the roots.

(C)
Some bacteria commonly present in the roots of potatoes digest the
chemicals that cause the nematodes to emerge from their cysts.

(D)
Trials have shown that spreading even minute quantities of the
chemicals on potato fields caused nine-tenths of the nematodes present
to emerge from their cysts.（D）

(E) The chemicals that cause the nematodes to emerge from their cysts are not emitted all the time the potato plant is growing.
a和d都有支持的意思啊。。。如何排除a
我觉得d有漏洞，就算虫子因为被喷了推销的化学物质90%都跑出来，但是无法被杀光光的话，农民肯定不会买这种东东的啊？？
请nn帮忙指点。

arcsun

推销的东西是可以骗这个虫子emerg from their cysts然后饿死他们！

A说emerged from their cysts的虫子可以被普通的药干掉。那还要这个推销的新产品干吗？没起到support作用。

D说十有八九可以给勾引出来饿死，已经很不错啦。哪有100%的农药啊。