阅读理解。根据短文内容完成下列句子。

      Liu Yun is a happy girl. Her mother is a teacher. And she is also Liu Yun's teacher. She teaches music

so Liu Yun sings very well. Every morning they go to school by school bus together.

      Liu Yun's father is an engineer. He likes drawing pictures. He works in a car factory. He designs cars.

He goes to work by subway.

1. Liu Yun's mother is a _____________ teacher.

2. Liu Yun and her mother go to school by _____________ bus together.

3. Liu Yun's father likes _____________ pictures.

4. Liu Yun's father is an _____________.

5. Liu Yun's father goes to work by _____________.

ADSL为了解决在更高频率上的信号衰减和串扰的问题，采用了（）技术。

A.调制和频分复用

B.调制和时分复用

C.调制技术和时分复用、回波消除

D.调制和多频复用，回波消除