选择题：[简答题,3.3分] 孕妇用药原则有哪些？

Does David ______?选择一项：A. like flying B. like to flyingC. likes flying

3. Think about it and answer me, why are you so happy now? 回答A. 思考一下这个问题，然后回答我“为

[简答题,10分] 简述煤气中毒的急救原则。

4. At last the Englishman got angry with the visitor though he tried not to show

[判断题,4分] 孕前身体状况与出生缺陷的发生关系密切，因此预防出生缺陷，生育健康宝宝，提倡从孕前开始（） A.正确B.错误