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单项选择题
A．Dr. Turner often gives quizzes.B．She didn’t expect to have a quiz today.C．She doesn’t know anything about the quiz, either.D．She didn’t know Dr. Turner’s lecture would be so interesting.
A．Dr. Turner often gives quizzes.
B．She didn’t expect to have a quiz today.
C．She doesn’t know anything about the quiz, either.
D．She didn’t know Dr. Turner’s lecture would be so interesting.
单项选择题
A．They are used for rescue work.B．They are taking the place of highflying jets.C．They have been widely used for various purposes.D．They are now used exclusively for commercial projects.
A．They are used for rescue work.
B．They are taking the place of highflying jets.
C．They have been widely used for various purposes.
D．They are now used exclusively for commercial projects.
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