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
Several tourism companies believe space travel is going to be a new profitable industry.
A．Y
B．N
C．NG
单项选择题
A．Big waves pose a threat to commercial navigation.B．The river current never flows faster ten miles per hour.C．The river reverses its flow several times a day.D．High tides can create sudden and unexpected rapids.
A．Big waves pose a threat to commercial navigation.
B．The river current never flows faster ten miles per hour.
C．The river reverses its flow several times a day.
D．High tides can create sudden and unexpected rapids.
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