单项选择题

A．The housing problem in the U. S.
B．The problem of taking drugs in the U. S.
C．The problem of unemployment in China.
D．The problem of the workers’’ strikes in England.
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单项选择题
A．They help to cure anxiety.B．They help patients to gain insight into the cause of anxiety.C．They help to control anxiety.D．They help patients to work efficiently.
A．They help to cure anxiety.
B．They help patients to gain insight into the cause of anxiety.
C．They help to control anxiety.
D．They help patients to work efficiently.
单项选择题
A．They defend the bone against viruses.B．They prevent oxygen from entering the bone.C．They break down bone tissue.D．They connect the bone to muscle tissue.
A．They defend the bone against viruses.
B．They prevent oxygen from entering the bone.
C．They break down bone tissue.
D．They connect the bone to muscle tissue.
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