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
（38）（）

A. freedom
B. discharge
C. release
D. liberty
单项选择题
The Eskimo is perhaps one of the most trusting and considerate of all Indians but seems to be（）the welfare of his animals.

A. critical about
B. indignant at
C. indifferent to
D. subject to
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