单项选择题

Yellowstone National Park is (one of) the (older parks) in the United States. It was (established) by Congress (in) 1872.

A．one of
B．older parks
C．established
D．in
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单项选择题
Everyone (who) takes the examination (will) receive (their) score reports (in) six weeks.
A．who
B．will
C．their
D．in
单项选择题
Nearly (three quarters) of the surface of the earth (are) covered with water, and there (would be) even less land (if) the polar icecaps were melted.
A．three quarters
B．are
C．would be
D．if
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