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【单选题】
有关物种的叙述中，正确的是（）①一个种群就是一个物种②具有一定的形态和生理功能，能相互交配且产生可育后代的一群生物个体③隔离是新物种形成的必然条件④在物种形成的过程中一定有地理隔离A.
①②③
B.
②③
C.
②④
D.
①④
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【简答题】Calvin Klein is one of the top ____________(design) in the world.
【单选题】Calvin Klein is one of the top________ in the world.
A.
design
B.
designer
C.
designers
【简答题】He has been ill _____ three years.
【单选题】What does the space trip start with?
A.
Getting a visa.
B.
Intensive training.
C.
Buying some tickets.
D.
Making a travel plan.
【简答题】系统调用是通过( ) 来实现的。当发生系统调用,处理器的状态会从( )态变为( )态。
【单选题】Calvin Klein is one of the top ________in the world.
A.
designers
B.
designer
C.
design
【单选题】He has been ill with a strange disease lately, ______I’ve never heard of before.
A.
it
B.
this
C.
that
D.
one
【单选题】He has been ill with a strange disease lately, ______I’d never heard of before.
A.
it
B.
this
C.
that
D.
one
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