单项选择题

There are more people who are obese today than 20 years ago.

A. gainfully employed
B. upwardly mobile
C. excessively overweight
D. privately educated
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单项选择题
Lincoln, who many regard as one of our great presidents, was often ______ despite his reputation of telling good jokes.
A. bright
B. optimistic
C. gloomy
D. cheerful
单项选择题
One of the effective ways to lessen environmental pollution is the reservation and protection of more swamps.
A. vast thick corals
B. pockets of wetland
C. warm volcanoes
D. millions of bees and wasps
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