单项选择题

A．A fuel that burns cleanly.
B．An oil additive that helps cool engines.
C．A material from which filters are made.
D．An insulating material sprayed on engine parts.
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单项选择题
A．It is not as bad as it used to be.B．Americans do not want to give up any more sleep.C．Americans guarantee to change the sleeping habits.D．Americans want to know just how bad it is to their health.
A．It is not as bad as it used to be.
B．Americans do not want to give up any more sleep.
C．Americans guarantee to change the sleeping habits.
D．Americans want to know just how bad it is to their health.
单项选择题
According to the context, the sentence But young actors with the stage in their blood are happy, at the end of the first paragraph means________.
A．they don’’t care if their job is hard
B．they like the stage naturally
C．they are born happy
D．they are easily satisfied
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