下列哪一个细胞里的染色体不成对存在_刷题宝

题干

下列哪一个细胞里的染色体不成对存在（）

A：卵细胞

B：受精卵

C：白细胞

D：上皮细胞

上一题下一题 0.0难度选择题更新时间:2019-02-15 09:44:29

答案(点此获取答案解析）

A

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下列说法不正确的是（）

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Mrs Smith gave her‘son some medicine and asked him to it twice a day．

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锌﹣溴蓄电池的充、放电的电池总反应为Zn+Br₂Zn²⁺+2Br^﹣，下列各反应：①Zn﹣2e^﹣=Zn²⁺；②Br₂+2e^﹣=2Br^﹣；③2Br^﹣﹣2e^﹣=Br₂；④Zn²⁺+2e^﹣=Zn，其中充电的阳极和放电的负极的反应分别是（　　）

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A. Are there any trees in it?

B. Because the air in the park is fresh and it is good for my health.

C. Do you often read books in the park?

D. There is a lake, a bridge and some small hills.

E. No, there aren't any flowers near the lake

Tem: What's in the central park(中央公园)?

Sarah: ____

Tom: ____

Sarah: Yes, there are.

Tom: Are there any flowers beside the lake?

Sarah: ____

Tom: ____

Sarah: Yes, I do.

Tom: Why not in the library?

Sarah: ____

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