单项选择题

Some adult dogs may weigh as much as 200 pounds, but most weigh between 20 and 50 pounds.

A. mature
B. female
C. special
D. wild
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单项选择题
The famous speech I Have a Dream was delivered by Dr. Martin Luther King in Washington, D. C. in 1963.
A. moving
B. remarkable
C. religious
D. well-known
单项选择题
Major earthquakes are among nature's most devastating (破坏性的) events, causing an incalculable loss of life and property.
A. unmentionable
B. unprofitable
C. impossible
D. immeasurable
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