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【单选题】
下面不属于近交系小鼠发生遗传漂移的原因是________。A.
外来基因组杂交进一个近交系
B.
近交系的基因在某些位点上仍存在杂合性
C.
DNA序列突变导致遗传突变
D.
饲养环境的突然改变
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举一反三
【单选题】My brother was still studying into the night while I was asleep. [ ]
A.
late; sound
B.
lately; wide
C.
deeply; far
D.
far; late
【简答题】While I was studying in the library a friend of mine sent me a __________ asking me if I wanted to have lunch with them.
【简答题】While l was studying in Madrid, I visited a lot of museums. ( ) in Madrid, I visited a lot of museums.
【简答题】阅读下列短文,从每题所给的四个选项(A、B、C、D)中,选出最佳选项,并填写在答题卡上。 When I was at university I studied very hard. But a lot of my friends did very little work. Some did just enough to pass exams. Others didn't do quite enou...
【单选题】My sister was still studying ______ into the night while I was ______ asleep.
A.
late sound
B.
lately wide
C.
deeply far
D.
far far
【简答题】EBSCO数据库公司开发了近100多个电子文献数据库。我校购买了其中的两个主要的全文数据库,它们分别是:( )和( )。
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