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【单选题】
两个亲本的基因型分别为AAbb和aaBB,这两对基因的遗传遵循自由组合定律,现欲培育出基因型为aabb的新品种,最简捷的方法是A.
人工诱变育种
B.
基因工程育种
C.
单倍体育种
D.
杂交育种
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皮皮学刷刷变学霸
举一反三
【单选题】Nobody knows if he will marry Julia. But he says if he ___________ her, he will tell us.
A.
marries
B.
will marry
C.
marry
【简答题】由抽象上升到具体的过程是理性认识回到实践的过程。 ( )
【简答题】经纪活动一共有三种方式分别是:
【单选题】He often says "I shall tell you about them." He often tells me that ____ will tell ____ about ____.
A.
I; you; them
B.
he; me; them
C.
he; you; us
D.
I; me; you
【单选题】He says he will tell ________ wants to know.
A.
whatever
B.
whoever
C.
whichever
D.
who
【单选题】Peter says he will tell Alice all this when he______her.
A.
will meet
B.
meet
C.
have met
D.
meets
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