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When ______ comes to research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.

A．it

B．this

C．that

D．which

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A．promises

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______surprises most of us.

A．Wolves are afraid of us	B．The fact that wolves afraid men
C．The fact that wolves are afraid of men	D．Wolves’ afraid of men

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A．that

B．when

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C．what are you looking for	D．what you are looking for

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B．missed

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