单项选择题

A. In a company. B. In a hospital.
C. On a bus. D. In a department store.
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填空题
______ (comparison) with what it was, it has improved greatly.
单项选择题
Which statement best expresses the main idea of the passage
A. Something about Solar Energy and pollution.
B. Solar Energy.
C. Energy and Pollution.
D. Energy and Money.
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