在细菌间直接传递DNA是通过
A．鞭毛
B．普通菌毛
C．质粒
D．性菌毛
E．内质网
参考答案：D
阅读下面这首宋诗，然后回答问题。
庭户无人秋月明，夜霜欲落气先清。
梧桐真不甘衰谢，数叶迎风尚有声。
⑴这首诗写了秋天的哪些景致？
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⑵本诗写梧桐，作者抒发了怎样的情感？使用了什么手法？
⑶古典诗词摹写梧桐抒发秋意，通常表达怎样的情怀？请举一例印证你的观点。
Why didn't you tell me there was no meeting today? I _____ all the way here _____the heavy snow.
A．needn't have driven；through
B．can't have driven；across
C．mustn't have driven；through
D．shouldn't have driven；cross
