单项选择题

Today dozens of scientific group in different countries have been（）the goal of a practical and economic way to use sunlight to split water molecules.

A. reaching
B. winning
C. chasing
D. pursuing

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单项选择题
I （）with the Browns during my stay in New York City.

A. put in
B. put down
C. put on
D. put up
单项选择题
（）money, she is quite rich. However, this does not mean that she is happy.

A. Concerning
B. As to
C. In terms of
D. In the light of
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