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问题 选择题

在有丝分裂过程中，细胞中DNA数目为本物种体细胞中DNA数目的两倍的时期是

①间期 ②前期 ③中期 ④后期 ⑤末期[ ]

A．①②③  

B．②③④  

C．②③⑤  

D．①③⑤

答案

答案：B

判断题

气体通过塔板时的压强降大小对板式塔操作特性没有明显的影响。
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单项选择题

Like other men of vision (有识之士) , Maceo had no time for racism, for the false idea that one race of men is better or worse than any other. Some of the whites of Cuba disagreed with him. They were Spanish settlers who thought that white was going to be better than black even in an independent Cuba.
One day Maceo was approached by a Spanish Cuban who suggested that the regiments of independence army should be divided into whites and nonwhites. Maceo made him a reply which became famous in Cuba. "If you were not white," Maceo said to this man, "I would have you shot on the spot. But I do not wish to be accused of being a racialist as you are, and so I let you go, but with the warning that I shall not be so patient another time. The revolution has no color.\

Maceo was the leader of the anti-racialism.
A. Right.B. Wrong. C. Doesn’t say.
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