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【单选题】
大量事实表明,在蛋白质合成旺盛的细胞中,较大和较多的核仁,这是因为( )A.
核仁把核物质与细胞质分开
B.
细胞中的蛋白质主要是由核仁合成的
C.
核仁可以进入细胞质中合成蛋白质
D.
核仁可能与组成核糖体的必需物质的合成有关
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A.
He wants to obtain an international driver's license that he can use both in the U.S. and in his country.
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C.
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A.
The man wants to obtain an international driver's license that he can use both in the U.S. and in his country.
B.
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