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一般单基因控制的植物雄性不育属于不育。它败育过程发生较，且败育得十分彻底，用常规方法得不到_

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It's no use asking the children to keep quiet. They can't help _________noise.
[ A]make
[B]to make
[C]making
[D] made

在涉及某一相对性状的正反交中，F₁均表现其中一个亲本的性状，则该性状的遗传由核基因控制。

嫁接是无性杂交也能实现基因重组，产生新的变异。

We know from the text that at Yellowstone_________.
[ A] temperatures can go from o t0 80 degrees
[B] it snows throughout the year except for summer
[C] thunderstorms can be seen throughout the year
[D]it is more windy and rainy illthe spring