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【单选题】
认为生物出现生存斗争的原因是（ ）A.
生物个体之间有强有弱
B.
生物同时存在着遗传和变异之间的矛盾
C.
生物过度地繁殖和有限的生存空间之间的矛盾
D.
适者生存，不适者被淘汰
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举一反三
【单选题】How do all food chains break?
A.
One kind of animals is eaten up.
B.
One kind of plants is destroyed.
C.
One kind of animals eats another.
D.
One of the links is destroyed.
【单选题】(The simplest) kind of plant, (alike) the simplest kind of animal, (consists of) (only one) cell.
A.
The simplest
B.
alike
C.
consists of
D.
only one
【单选题】Scientists _____ DNA from one kind of plant and _____ it into another kind of plant to make a pretty new one. [ ]
A.
take, give
B.
make, put
C.
make, give
D.
take, put
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