单项选择题

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
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 fille
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 fille
单项选择题
According to the passage what is unknown to many people is that______
A．the drip cup benefited light industry.
B．the truth about carver was twisted or concealed.
C．sugar-refining owes a lot to a Negro.
D．a Negro invented the frying pan.
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