单项选择题

Dozens of scientific groups all over the world have been ______ the goal of a practical and economic way to use sunlight to split water molecules.

A．pursuing
B．chasing
C．reaching
D．winning
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单项选择题
The purpose of a ______ is to cut down imports in order to protect domestic industry and workers from foreign competition.
A．tax
B．toll
C．fee
D．tariff
单项选择题
As a result of careless washing the jacket ______ to a child's raze.
A．compressed
B．shrank
C．dropped
D．decreased
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