OG-134请教

helen6294

我正在做这题呢。认为答案是C~。杀害虫的时候，把益虫也杀了，不是不明智的举动吗？

对了，这题好多生词，看不明白，是查过后才得出C……

ustchero

自己的问题忘了写了：题干中 Only when a caterpillar has grown to the right size for pupation to take place does a special enzyme halt the production of juvenile hormone.  做题略读的时候这句的大概意思能懂，但是回头细读的时候被这句的结构给弄糊涂了。

请教nn这句正常顺序是不是这样：A special enzyme halt the production of juvenile hormone to take place only when a caterpillar has grown to the right size for pupation？

[此贴子已经被作者于2007-10-28 20:59:24编辑过]

helen6294

to take place似乎应该放在only when从句的最后面。我觉得这样看得明白一些。

doooopo

我认为理解advisable是关键，advisable的解释是，something advisable should be done in order to avoid problems or risks.这里的就是指eradicate agriculturally beneficial insects吧

lift1217

Only when a caterpillar has grown to the right size for pupation to take place a special enzyme halts the production of juvenile hormone