单项选择题

A．Paid much attention to the results of scientific discoveries.
B．Seldom introduced safety laws before disasters occurred.
C．Hardly ever looked into the causes of tragedies.
D．Imposed safety rules as soon as accidents took place.
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单项选择题
A．She worked in a supermarket for tuition.B．She helped someone to learn to read.C．She gave single mothers the help that they needed.D．She went to a training program to help a volunteer.
A．She worked in a supermarket for tuition.
B．She helped someone to learn to read.
C．She gave single mothers the help that they needed.
D．She went to a training program to help a volunteer.
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