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.

Q6,对于选项E,从cysts中出来，一定就会死吗？提干中没有给这样的信息呀？

(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.

Q6,对于选项E,从cysts中出来，一定就会死吗？提干中没有给这样的信息呀？

文中说any nematodes that emerge will soon starve to death.那就不要再怀疑是不是会死；肯定会死。

 thanks so much

a lot of kisses to lovely ethl

我的逻辑思路

条件　化学物质可以使虫子出来

结论　我们在有果实之前喷　　这样虫子出来了就回没有东西吃而死掉

加强结论　我选的Ｅ选项　如果这种物质在土豆生长的所有时间都可以分泌的话那么每时都有虫子孵化出来　这个时候用人工合成的这种物质用处就不大了啊

可以再讨论　可能我的理解有问题吧

many  thanks !!!!