根据句意，用所给词的适当形式填空。for later how do are

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问题填空题

根据句意，用所给词的适当形式填空。

for later how do are can this

1.              I speak to your brother?
2. What               you doing?
3. She is               homework.
4. See you              .
5.               is everybody doing?
6. There is a call              you.
7.               is John speaking.

答案

1. Can 2. are 3. doing 4. later 5. How 6. for 7. This

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降低慢性病对人民健康的损害程度，只能依靠（）

A.健康（卫生）宣传

B.健康教育

C.健康传播

D.健康促进

E.健康干预

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单项选择题

鸟嘌呤N-7位烷化作用的后果有（）。

A．鸟嘌呤脱落

B．脱嘌呤

C．作用碱基缺失

D．移码突变

E．以上都是

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