单项选择题

A．It served as a fertilizer for crops.
B．It formed a new mountain.
C．It stabilized air temperatures.
D．It destroyed various insect pests.
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单项选择题
A．She didn’t go to work this morning.B．She was injured and had to go to the hospitalC．She talked with the boss in the morning.D．The traffic delayed her.
A．She didn’t go to work this morning.
B．She was injured and had to go to the hospital
C．She talked with the boss in the morning.
D．The traffic delayed her.
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