关于葡萄胎下述错误的是（） A.葡萄胎患者较早出现妊高征征象 B.葡萄胎及侵蚀性葡萄

When delivering a speech, you should adjust your language to the age of your ______ audience.

A．target

B．entry

C．boundary

D．concept

选词填空

从方框中选择正确的单词并用其适当形式完成下面的句子。

小题1:How many _______ are there in the factory?

小题2:Mr White often goes for a walk with his _________ dog.

小题3:Have you _________ dinner?

小题4:We like our Chinese teacher, so we listen to her lessons ________.

小题5:There are two books on the desk. One is mine, the other is ________.

小题6:October is the _________ month of a year.

小题7:If we don’t protect the environment, our future will be _______.

小题8:________ you for your help, it’s very kind of you.

小题9:We should stop the factory from ________ the river.

小题10:Paper________ by Cai Lun in Han Dynasty.

情景交际，选择正确答案。

1. 当你想了解Zhang Peng的爸爸的职业时，你问：[ ]

A. What's your father?

B. Who's your father?

2. 你的朋友跟你说明天见，你听到的是：[ ]

A. See you.

B. See you tomorrow.

3. 你告诉朋友你有一个新橡皮擦，你说：[ ]

A. I have a new ruler.

B. I have a new eraser.

4. 当别人问你朋友的爱好时，你应说：  [ ]

A. My friend is tall.

B. My friend likes painting.

5. 当你认为别人说得对时，你应说：[ ]

A. You are right.

B. All right.

电气设备发生绝缘击穿，外壳带电，当工作人员触及外壳时，将造成人身触电事故，为防止这种融电事故的发生，最可靠、最有效的办法是采取（）。

A、保护性接地；

B、保持安全距离；

C、装设安全标志；

D、不去碰它。

离心风机在生产过程中，一旦出现喘振现象，要及时降低出口压力，迅速打开（），使之脱离喘振区。