单项选择题

56（）

A．how
B．what
C．which
D．whether

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They are trying to develop a convincing theory to explain how the needles work in preventing pain, or why a needle in the wrist, for example, would prevent the pain in the area of the mouth. ( Passage 3 )
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They move here and there and can get into a man’ s eyes or into the spaceship’ s instruments. ( Passage 2 )
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