A） 对话理解： 听下面5段对话，每段对话后有一小题，从题中所给的A、B、C、三个选项中选出最佳答案，每段对话和问题读两遍。
( )1. What day is it tomorrow?
A. Monday B. Tuesday C. Wednesday
( )2. Which box is the heaviest of all?
A. The white one B.the black one C. the brown one
( )3. How much does the beef cost?
A. 12 yuan B. 24 yuan C. 6 yuan
