第一节
听下面5段对话。每段对话后有一个小题，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。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。
What was the girl’s low grade

A． An experience.
B． A lot of questions.
C． The weather

A． It served as a fertilizer for crops.
B． It formed a new mountain.
C． It destroyed various insect pests.