根据汉语提示完成句子。  

1. Can you___________（想象）what the life will be like in 2050?

2. Mum is cooking in the___________（厨房）now.

3. The___________（影响）of climate on crops is great.

4. He was so_________（紧张的）when he saw his teacher for the first time.

5. A man's life loses its__________（意义）if he has no interest.

6. Shooting of firecrackers can be___________（危险的）.

7. He was________（期望）to be here by nine. But he hasn't come yet.

8. The boy is so shy that he always keeps__________（沉默的）before strangers.

9. Look! The children are playing happily on the_________(操场）.

10. It's said that Lisa's___________（丈夫）is a brave policeman.

效能的定义是指（）

A.一定剂量的药物所引起的效应强度

B.药物所能引起的最大效应

C.等效反应时药物的相对剂量或浓度

D.药物所能引起的临床效应

E.一定剂量的药物所引起的最大效应强度