何谓母性影响？
参考答案：
由于母本基因型的影响，使子代表现母本性状的现象叫做母性影响，又叫前定作用。
按要求改写下列句子，每空填一词。
1. She has many books. (改为一般疑问句，并作否定回答)
___________ she ___________ many books?
___________, she ___________.
2. We have a big TV set in our house. (改为否定句)
We ___________ ___________ a big TV set in our house.
3. This is a ruler. (改为复数形式)
___________ ___________ ___________.
4. I am Tony. (改为同义句)
___________ ___________ ___________ ___________.
5. He has eggs and milk for breakfast. (对画线部分提问)
___________ ___________ he ___________ for breakfast?
汽车空调制冷系统由压缩机、冷凝器、贮液干燥器、（）、蒸发器和鼓风机等组成。
A、继电器
B、膨胀阀
C、蓄电池
D、发电机
