下列对菠菜根的分生区细胞分裂过程的叙述中，正确的是(　)_刷题宝

题干

下列对菠菜根的分生区细胞分裂过程的叙述中，正确的是( 　)

A：在DNA复制的时期，DNA和染色体的数目增加一倍

B：在核膜和核仁消失后，中心体发出星射线形成纺锤体

C：在染色体形态固定、数目清晰的时期，着丝点排列整齐

D：在染色体逐渐解开螺旋的时期，细胞中央出现由细胞壁构成的赤道板

上一题下一题 0.0难度选择题更新时间:2019-08-30 03:44:29

答案(点此获取答案解析）

C

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已知l₁的斜率是2，l₂过点A(-1，-2)，B(x，6)，且l₁∥l₂，则lo

g_{\frac{1}{9}}

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莫莉如此害怕以至于她都不能动了。

Molly was____ ____ ____ she couldn't move．

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The pencils are ____ (in/in front of) the pencil box.

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下列说法正确的是（　　）

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判断下列句子是否与短文相符。

I'm Peter. There are four people in my family. They are my father, my mother, my grandfather and me. I'm twelve. My birthday is on 15th March. My parents are both doctors. They help people. Their birthdays are both in May. My grandfather is old. He is sixty-five. His birthday is on 9th June. He likes reading. I like reading too. I want to be a teacher in the future. I want to teach Chinese in a school.

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