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【单选题】
马（2N＝64）和驴（2N＝62）杂交能产生后代称骡子，能够正常发育，但不能生育，这种情况称之为（），上述情况产生的原因是（）A.
杂交育种；染色体结构发生了变化
B.
生殖隔离；发生了突变
C.
基因重组；驴的遗传物质有本质区别
D.
生殖隔离；减数分裂过程中联会紊乱
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举一反三
【单选题】Once we stepped off the plane and onto the prairie, we were greeted by a gust of _____ and biting wind.
A.
invasion
B.
campaign
C.
efficient
D.
raw
【单选题】Once we stepped off the plane and onto the prairie, we were greeted by a gust of —— and biting wind.
A.
raw
B.
decisive
C.
desperate
D.
crucial
【简答题】Once we stepped off the plane and onto the prairie, we were greeted by a gust of _____ .
【单选题】Once we stepped off the plane and onto the grassland, we were greeted by a gust of ___ and biting wind.
A.
terrible
B.
horrible
C.
raw
D.
devastating
【简答题】Once we stepped off the plane and onto the prairie 草原 , we were greeted by the gust of raw and biting wind.
【简答题】Once we stepped off the plane and onto the prairie, we ware greeted by a gust of ( ) and
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