题目内容

根据你所学遗传学知识。引起植物花粉败育的原因有哪些？各有哪些特点？

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[A] unnamed
[B]unforgettable
[Cl unbelievable
[D] unreal

试解释基因、基因组、基因组学、核型概念。

第一节单项填空
从[A]、[B]、[C]、[D]四个选项中，选出可以填人空白处的最佳选项，并在答题卡1上将该项涂黑。
21.It is an exciting moment for Chinese people this year, ____for the first time the O-lympic Games will be held in China.
[A] that
[B]while
[C] which
[D] when

The word " skewed" (Line 3 ,Paragraph 4) most probably means
[ A] determined.
[ B] directed.
[ C] disclosed.
[ D] distorted.