饮水的适宜氟浓度应控制在（） A.0.5mg／L以下 B.1mg／L以下 C.0.5

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问题单项选择题 A1/A2型题

饮水的适宜氟浓度应控制在（）

A.0.5mg／L以下

B.1mg／L以下

C.0.5～0.6mg／L

D.0.5～0.7mg／L

E.0.7～1mg／L

答案

参考答案：B

补全对话，情景问答

用词、短语或句子补全对话。

A: 1._______?

B: I have bread and milk for breakfast.

A: Do you eat eggs?

B: Yes , I do.

A: Well. 2. _______?

B: Two eggs.

A: I know, 3. _______?

B: I drink milk every day.

A: 4._______?

B: Not very much. But my father 5._______ me to drink it, he says milk

6. _______ my health. 7._______?

A: Cola is my favorite drink.

B: I think drinking too much cola is 8._______ your health. Cola is junk food, so try to drink less.

A: OK, I will.

单项选择题

5个月母乳喂养儿，生长发育良好。现母乳量略有不足，正确的做法是

A．改为人工喂养
B．改为部分母乳喂养
C．改为混合喂养
D．继续母乳喂养，并开始添加辅食
E．改为人工喂养，并开始添加辅食