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【单选题】
关于精子的描述下列哪项正确A.
由精子细胞经减数分裂形成
B.
离开睾丸时已有受精能力
C.
从精原细胞经两时间发育而成
D.
精子头部有细胞核和顶体
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举一反三
【单选题】Small farms and the lack of modern technology have _____ agricultural production.
A.
blundered
B.
tangled
C.
bewilder
D.
hampered
【单选题】The production possibilities frontier is a
A.
map which shows the frontier beyond which agriculture is unprofitable.
B.
map which shows areas of the world in which capitalist production is now possible.
C.
graph which shows the various combinations of resources that can be used to produce a given level of output.
D.
graph that shows the various combinations of output the economy can possibly produce given the available resources and technology.
【简答题】燎 _______ , __ 溽暑。
【单选题】Small farms and the lack of modern technology have______ agricultural production.
A.
blundered
B.
tangled
C.
bewildered
D.
hampered
【单选题】Small farms and the lack of modem technology have ______ agricultural production.
A.
blundered
B.
tangled
C.
mingled
D.
hampered
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