题目内容

What can be inferred from the last paragraph?
[A] Whether or not to have a nucleus is important in biology.
[B ] The speaker will tell us how to distinguish bacteria tomorrow.
[ C] Evolution will be the main topic of the program next time.
[ D] Eukaryotes develop from prokaryotes.

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[ A ] recently
[ B ] frequently
[ C ] realistically
[ D ] immediately

如果你发现了一株雄性不育植株。你如何确定它究竟是单倍体,远缘杂交F1、生理不育、核不育还是细胞质不育?

玉米T、S、C 3组不育类型。用自交系测交,结果有些自交系对这3组均可恢复;有些对3组均不能恢复;还有一部分或能

—________the town was attacked by the storm several times, Iittle damage was done.
[A]As
[B]lf
[C] Since
[D]Although

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