单项选择题

A．There is better medical care.
B．The retirement age has changed.
C．Living conditions are improved.
D．Families are getting smaller.
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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.
单项选择题
A．she had promised that she would.B．she has been sick.C．she needs his approval for her schedule.D．she must verify his plans.
A．she had promised that she would.
B．she has been sick.
C．she needs his approval for her schedule.
D．she must verify his plans.
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