计算孕产妇死亡率的分母是（）
A.某年平均人口数
B.某年15～49岁妇女数
C.某年活产儿总数
D.某年结婚登记人数
E.某年孕妇数
参考答案：C
单词拼写。
1. Many students attended the lecture, i______ our monitor.
2. Though he is not a n______ English speaker, he can speak English very fluently.
3. Though I haven't met him for many years, I could r______ him immediately I saw him in the crowd.
4. He thought I had known the fact. But a______, I knew nothing about it.
5. Luckily, after the earthquake, the people have got a lot of i ______ help.
艾滋病的各种感染主要在
A．肺、胃肠与神经系统B．肾脏C．血液系统D．皮肤E．心脏
