单项选择题 第二节听下面5段对话或独白。每段对话或独白后有几道小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有5秒钟的时间阅读各个小题；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。听力原文：W: There are so many people in your house. What are they doing?M: We are having a party. I am the host and my wife is the hostess.W: Are they your guests?M: Yes, they are. They are all my friends.W: Who is that man?M: He is Professor Zhang. He is a Chinese teacher. His wife is a teacher, too. Their daughter is a college student.W: Who is that young man?M: He is her boyfriend. He is a young doctor. His name is Karl Black.What are the people in the house doing?A．They're having dinner.B．They're having a party.C．They're watching TV.

单项选择题 Compared with adults learning a foreign language, children learn their native language with ease.（）

单项选择题 某抢险救灾工程，工期紧迫，无法按常规编制招标文件，则在招标时宜采用成本加酬金合同形式中的（）。