单项选择题

What is the man planning to do

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