阅读理解。

     Han Mei is a Chinese girl. She is thirteen. Her brother's name is Han Lin. He is fourteen. Han Mei

is a middle school student. She is a good student. Han Lin and Han Mei go to the same school. Han

Mei's father is a doctor. Her mother is an English teacher.

1. How old is Han Mei?

A. She is 11 years old.                  

B. She is twelve.

C. She is 13.                                    

D. She is fourteen.

2. What's her brother's name?

A. Her brother's name is Han Ping.

B. He is Han Mei.

C. His name is Han Bing.

D. His name is Han Lin.

3. Does Han Lin go to school?

A. Yes,  he goes to the same school.

B. No,  he is a worker.

C. No,  he is a student.

D. Yes,  he goes to a different school.

4. Is their father a teacher?

A. Yes,  he is.                          

B. No,  he isn't.

C. Yes,  he's.                            

D. No,  he is.

5. Is their mother a doctor or a teacher?

A. Yes,  she is a doctor.

B. Yes,  she is a teacher.

C. She is a doctor.

D. She is a teacher.

电磁波已成为人类现代生生产不可缺少的伙伴和工具。

（1）电磁波在真空中的传播速度是           m/s；

（2）验钞机上使用的       线属于电磁波的一种。

（3）将手机的“背景灯光提示”功能打开后放在真空罩中，用抽气机抽罩中空气，打电话呼叫罩中手机，不能听到手机响铃声，这一现象在本实验中的作用是       ，能够看到背景灯闪烁，这一个现象说明：              。

（4）     材料制成的壳体或网罩对电磁波有屏蔽作用。