单项选择题

Coal has been ______ by natural gas as a major source of energy.

A．displaced
B．deposited
C．displeased
D．disposed
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单项选择题
I didn't make out what the professor means because his handwriting is so ______.
A．eligible
B．illegible
C．knowledgeable
D．vague
单项选择题
What suggestion does the author make in order to grasp this opportunity
A．Search for new energy sources.
B．Forbid motor transportation.
C．Accept a new life style.
D．Adopt a new form of invention.
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