单项选择题

A．Because it is a personal and economic problem as well as a social one.
B．Because it is a totally personal problem.
C．Because it is a huge burden on economics.
D．Because it is social problem.
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单项选择题
A．She has to have worked in a hospital once.B．She has to have some experience of hotel work.C．She has to know foreign languages.D．She has to know how to fly a plane.
A．She has to have worked in a hospital once.
B．She has to have some experience of hotel work.
C．She has to know foreign languages.
D．She has to know how to fly a plane.
单项选择题
A．He had many bad habits.B．He had false teeth that were made of wood.C．He established a dental school.D．He once hunted elephants.
A．He had many bad habits.
B．He had false teeth that were made of wood.
C．He established a dental school.
D．He once hunted elephants.
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