单项选择题

A．Stone.
B．Hard wood.
C．Bone.
D．Metals.
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单项选择题
A．They can cause heart attack.B．They can raise one’s blood pressure. C) They are not acceptable to most people.C．They can damage arm muscles.
A．They can cause heart attack.
B．They can raise one’s blood pressure. C) They are not acceptable to most people.
C．They can damage arm muscles.
填空题
expresses
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