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问题 单项选择题

1，25（OH）D的生理作用是（）

A.使血钙升高，血磷降低

B.使血钙降低，血磷升高

C.对血钙、血磷浓度无明显影响

D.使血钙、血磷均降低

E.使血钙、血磷均升高

答案

参考答案：E

句型转换

按要求改写句子。

1. He walks to school every day. (改为否定句)

    He ________ ________ to school every day.

2. The twins go to school at 7:30 every moming. (对画线部分提问)

    _________________________________________?

3. The bus ride usually takes about 25 minutes. (同上)

     ________ the bus ride  ________?

4. The children decided to go to the park by bus. (改为同义句)

    _________________________________________

5.  My uncle walks to work every day. (对画线部分提问)

    ________ ________  your uncle ________  ________ work every day?

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单项选择题

下列哪种细胞不形成胶质瘤（）。

A．星形胶质细胞

B．室管膜细胞

C．小胶质细胞

D．少突胶质细胞

E．原始神经上皮细胞
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