单项选择题

A．prevent people from having trouble with teeth
B．stop teeth from falling out
C．put men on the moon
D．transplant hearts and other organs
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单项选择题
A．answer questions about its temperatureB．translate the sounds into imagesC．know how gases inside ebb and flowD．measure the pitch
A．answer questions about its temperature
B．translate the sounds into images
C．know how gases inside ebb and flow
D．measure the pitch
单项选择题
A．According to the movement and vibrations of hot gassesB．The trade winds blow on EarthC．The riversD．The sound travel through the space
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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