同义句转换。

1. You are too young to go to school.

You are _____ _____ _____ you can't go to school.

2. Welcome to China in spring, summer, autumn or winter.

Welcome to China in _____ _____.

3. Can I help you?

_____ _____ _____ I can do for you?

4.When she calls me, I'll tell you at once.

I'll tell you _____ _____ _____ she calls me.

5. It isn't meaningless, I think.

I _____ think it's _____.

下列经济业务中，因经营活动而引起的现金流入有（）。

A.收到咨询收入

B.销售商品取得货款

C.收到出口退税

D.支付设备价款

E.支付现金股利