建设工程担保中，担保金额在担保有效期内逐步减少的担保是( )。
A．投标担保
B．支付担保
C．预付款担保
D．履约担保
参考答案：C
根据句意和首字母提示，补全下列单词。
1. I have a toothache and I have to go to the d_________.
2. — I'm sorry, I can't go to the movies with you.
— That's too bad. Maybe a_________ time.
3. Liu Li and Liu Ying are twins. They have some things in c_________.
4. Sauce is a kind of r_________.
5. He b_________ a doctor when he was 23.
可散瞳的药物是( )
A．多巴胺B．新斯的明C．阿托品D．异丙肾上腺素E．毛果芸香碱
