用a，all或the填空(不用填时请画“/”)。

1. It took US about______ hour to go to ______ Hainan Island by ______ plane.

2. This is ______most important question of all.

3. Mike is never late for school, he is always ______first one to arrive.

4. —Where is ______ guide?

    —He’s standing in line to buy ______tickets for us.

5. ______Greens are on______ visit to______ beautiful city in China.

6. June 1st is ______Children’s Day.

7. When she woke up, she found herself in______ hospital.

8. Pass me ______dictionary next to the radio and I also need______ pen to write something.

9. We can’t see ______ sun on a rainy day.

10. ______ China is______ old country with______ long history.

根据溶出原理达到缓释作用的方法是（）

A．与高分子化合物生成难溶性盐

B．乙基纤维素包制的微囊

C．药物溶于膨胀型聚合物中

D．以硅橡胶为骨架

E．通过化学键将药物与聚合物直接结合