单项选择题

Questions 11 to 18 are based on the conversation you have just heard

A．It does not concern John.
B．John will help him fix the ear.
C．John does not care about his car.
D．He wants John to fix the car.
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单项选择题
A．The high temperatures required for its use.B．The high cost of materials used in its production.C．The lack of trained environmental engineers.D．The opposition of automobile manufacturers.
A．The high temperatures required for its use.
B．The high cost of materials used in its production.
C．The lack of trained environmental engineers.
D．The opposition of automobile manufacturers.
单项选择题
A．A fuel that burns cleanly.B．A material from which filters are made.C．An oil additive that helps cool engines.D．An insulating material sprayed on engine parts.
A．A fuel that burns cleanly.
B．A material from which filters are made.
C．An oil additive that helps cool engines.
D．An insulating material sprayed on engine parts.
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