单项选择题

A．Boston schools.
B．Frontier life.
C．Teaching requirements.
D．Immigration patterns.
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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 stabilized air temperatures.D．It destroyed various insect pests.
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.
问答题
What makes going to space the most expensive vacation is the enormous cost involved in________.
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