胎儿4小时后方能娩出的分娩止痛可用

A．吗啡

B．阿司匹林

C．二氢埃托啡

D．芬太尼

E．哌替啶

1.It is a good habit to brush your        (tooth) after each meal.

2. Many school things were         (send) to Yushu last month.

3. Betty is often seen        (help) the old man with his housework.

4. He prefers         (take) part in the public activities rather than stay at home alone.

5. They         (agree) with each other,  so they argued for a long time.

6. Animals are our friends, so       (protect) them is our duty.

7. You have        (award)a scholarshrp to study violin at our School of Music.

8. It takes         (little) time to go there by underground than by bus.

9. Many       (butterfly) have round marks on their wings that look like eyes.

10. Last night it rained        (heavy)in the southern part of the city.

11. There are many        (different) between the two languages.