第一节
听下面5段对话。每段对话后有1个小题，从题中所给的A、B、C、三个选项中选出最佳答案，并将其标号填入题前括号内。每段对话读两遍。
（ ）1. Where are they talking?
A. At a school. B. At a friend’s house. C. In a restaurant.
( ) 2. What does the man mean?
A. He didn’t take vitamin C.
B. Vitamin C wasn’t helpful to his cold.
C. He ate too much vitamin C.
