GWD28-Q21！！！！！！

[复制链接]

sana0915

41^#

发表于 2017-9-30 09:56:05 | 只看该作者

The original subject is "single locusts".

The second part of the sentence doesn't describe single locusts. The subject of choice E is still "single locusts", so E is nonsense.

The appearance of "locusts" in choice A is NOT "less concise"; it's actually necessary, to specify that we're now discussing the behavior of locusts in general, not single locusts.