行车防护人员在执行任务时，要坚守岗位，思想集中，要与作业组（），认真、及时、准确地进

用所给词的适当形式填空。

1. Maria _____ (can) speak when she was two years old.

2. — Look! Tom is having lunch.

    — Yes, he often _____ (have) lunch at half past twelve.

3. Do you enjoy _____ (play) basketball?

4. We should _____ (finish) the work on time.

5. The boy _____ (stay) up until the TV said goodbye.

6. ____ our sister _____ (have) any milk?

7. Why _____ (not tell) me about it early?

8. —_____ they _____ (go) home yesterday?

    — Yes, they did.

9. They each _____ (have) a CD in their bags.

10. It is a good time _____ (sing) now.

成品保护的一般措施有（）。

A.防护、包裹

B.旁站监理

C.覆盖、封闭

D.巡视

E.合理安排施工顺序

Would you please keep silent? The weather report               and I want to listen.  [ ]

A. is broadcast          

B. is being broadcast

C. has been broad cast    

D. had been broadcast  

酮体包括( )

A．α酮丁酸、β羟丁酸、丙酮
B．β酮丁酸、β羟丁酸、丙酮酸
　
C．乙酰乙酸、α羟丁酸、丙酮酸
D．乙酰乙酸、β羟丁酸、丙酮
　
E．以上均不正确

甲、乙于6月1日签订一运输木材合同，由乙将木材从北京运至上海，到上海后甲即付运费。乙于6月3日运到后，甲未付费。乙可对该批木材行使下列什么权利

A．抵押权

B．质押权

C．留置权

D．优先购买权