单项选择题

A．He knew this beforehand.
B．He judged from his common sense.
C．He judged from the speeds of sound
D．He judged by reading the textbook.
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单项选择题
A．She was sick.B．She lost her job.C．She said goodbye to her boyfriend.D．She failed in the interview.
A．She was sick.
B．She lost her job.
C．She said goodbye to her boyfriend.
D．She failed in the interview.
单项选择题
A．By asking some students to explain the reason.B．By giving them a test on the speed of sound.C．By using a vivid question to check them.D．By asking the students to restate his words.
A．By asking some students to explain the reason.
B．By giving them a test on the speed of sound.
C．By using a vivid question to check them.
D．By asking the students to restate his words.
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