单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

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．Decide for himself what is best.B．Communicate his career hopes.C．Stop hindering his own progress.D．Look for another career.
A．Decide for himself what is best.
B．Communicate his career hopes.
C．Stop hindering his own progress.
D．Look for another career.
单项选择题
A．Why species don’t avoid extinction by adapting.B．Why species become extinct at the rate they do.C．Why humans aren’t extinct.D．How many species aren’t extinct.
A．Why species don’t avoid extinction by adapting.
B．Why species become extinct at the rate they do.
C．Why humans aren’t extinct.
D．How many species aren’t extinct.
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