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【单选题】
基因工程操作应用的许多载体质粒都有抗生素的抗性基因,这是为了便于A.
带有目的基因的宿主菌的筛选
B.
宿主菌的生物繁殖
C.
质粒的转化
D.
外源基因插入质粒
E.
目的基因的表达
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举一反三
【单选题】I really feel like ______a talk with Daniel about her lessons but don’t know how to pick it up.
A.
to have
B.
having had
C.
to having
D.
Having
【单选题】—How was your holiday? —______. [ ]
A.
Not good at all
B.
Not bad
C.
I don't want to talk about it
D.
Don't mention it
【简答题】When we talk about how agers are getting worse and worse now, most young people don’t agree. agers always say they are growing up. They can have part-time jobs. And they can even drive a car. ...
【单选题】What went extinct and what lived in the deep ocean?
A.
coelacanth went extinct and the giant squid lived in the deep ocean.
B.
the giant squid went extinct and coelacanth lived in the deep ocean.
【单选题】What ocean did they have to go across?
A.
The South Atlantic Ocean.
B.
The North Atlantic Ocean.
C.
The East Pacific Ocean.
D.
The West Indian Ocean.
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