题目内容

What does the author refer to as one of the greatest failures of the 107'h Congress？
[ A] The House of Representatives did not agree with the Senate.
[ B] The unemployment insurance extension was not approved.
[C] A boost to the economy was not provided.
[ D] Relief to those in need was not offered.

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以下四个选项中，能折叠成左边的图形的是（）。

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？

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

试解释基因、基因组、基因组学、核型概念。