单项选择题

A．140.
B．50.
C．90.
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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.
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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