单项选择题

What is the main topic of the conversation

A．It served as a fertilizer for crops.
B．It formed a new mountain.
C．It destroyed various insect pests.
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单项选择题
A．an experienceB．a lot of questionsC．the weather
A．an experience
B．a lot of questions
C．the weather
单项选择题
A．Improve his grades.B．Write to the director of the flight program.C．Use his professors at references.
A．Improve his grades.
B．Write to the director of the flight program.
C．Use his professors at references.
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