单项选择题

It is certainly good for me physically, though I am a little ______ about its ultimate good.

A．ambiguous
B．dubious
C．erroneous
D．vicious
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单项选择题
The multibillion-dollar fitness industry ______ fat profits from our hunger to look good.
A．comes in
B．gets in
C．ropes in
D．rakes in
单项选择题
The helmets are designed to ______ impacts equivalent to a fall from a bicycle.
A．withhold
B．withstand
C．withdraw
D．wither
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