单项选择题

The organization has so far raised $2.5 million to finance bone ______ trans-plants for children.

A．marrow
B．moron
C．mussel
D．mire
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单项选择题
Changing from solid to liquid, water takes in heat from all substances near it, and this ______ produces artificial cold surrounding it.
A．absorption
B．transition
C．consumption
D．interaction
单项选择题
A research worker might ______ that the existence of such kind of disease is due to the pollution of the are
A． referB. inferC. conferD. prefer
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