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
One day I ______ a newspaper article about the retirement of an English professor at a nearby state college.
A．came across
B．came about
C．came after
D．came at
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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