单项选择题

How do the scientists measure the pitch

A．According to the movement and vibrations of hot gasses
B．The trade winds blow on Earth
C．The rivers
D．The sound travel through the space
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单项选择题
Which of the following is true
A．Andrew prefers filling the bad tooth to taking it out.
B．Jackie prefers to have the bad tooth filled rather than pulled.
C．Neither Andrew nor Jackie likes to have a tooth filled.
D．Jackie and Andrew would rather have a tooth filled.
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