词汇运用

1．Don't choose a day that you know is going to be ________(有压力的),such as the day

of an exam.

2．They soon ________(适应了) hard work and poor food.

3．Lastly,you can become ________(精神上) addicted.

4．If I can't borrow the money,I shall have to ________(没有也可应付)．

5．We must ________(生产) more food for ourselves and import less.

6．He was ready to ________(冒险) being taken prisoner by the enemy.

7．They were caught selling ________(违法的) drugs.

8．Clearness of ________(陈述) is more important than beauty of language.

9．Practice makes ________(熟能生巧)．

10．He showed excellent ________(判断力) in choosing the wine.

兴奋-收缩耦联的关键物质是

A．Na⁺

B．K⁺

C．Ca²⁺

D．乙酰胆碱

E．Mg²⁺