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【单选题】
人工选择之所以能培育出生物新品种，自然选择之所以能形成新的物种，它们共同的选择基础是（ ）A.
生物很强的繁殖能力
B.
生物的遗传和变异是普遍存在的
C.
生物都在进行生存竞争
D.
人和自然的选择力量
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皮皮学刷刷变学霸
举一反三
【单选题】What were Forrest Gump's problems when he was born?
A.
His mother regards him as a normal child and tells him that he is the same as the other boys.
B.
Gump is almost a representative of all the virtues : honesty and trustworthiness , serious work , courage fearless .
C.
People always think this kind of person can't be successful in doing anything.
D.
Gump was born with a lower IQ-75 , meanwhile he has a muscle problem.
【简答题】直流电动机电刷装置的作用是通过固定的电刷和旋转的换向器之间的活动接触，使旋转的（）相连接。
【多选题】The Story of Money.mp4 What were the problems with barter?
A.
The items were of the similar value
B.
Many items got rotten
C.
Some items were too heavy
D.
Items become more and more complicated
【单选题】Can you solve such problems ___raised by the audience?
A.
what were
B.
as were
C.
that were
D.
which were
【单选题】What were the farmers and villagers' attitude toward the measures passed by the government?
A.
They accepted them because what they demanded has been met.
B.
They partially accepted them.
C.
They added some more demands to the measures.
D.
They were not satisfied with them because the measures didn't solve some very important problems.
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