按要求转换句子，每空一词

1. The book cost me ten yuan. (改为一般疑问句)

________ the book ________ ________ ten yuan?

2. Would you like to wear blue coat? (做出肯定回答)

________, I ________ ________ ________.

3. We bought some pens for children. (改为否定句)

We ________ ________ ________ pens for children.

4. They eat fast food once a week. (就划线部分提问)

________ ________ ________ they eat fast food?

5. They were at school at noon yesterday. (改为一般疑问句)

________ ________ at school at noon yesterday?

电子商务安全的内容包括（）

A.交易平台安全

B.电子商务系统安全管理制度

C.第三方物流安全

D.企业系统安全