单项选择题

A．The trouble of melting coniine oxide.
B．The high price of it.
C．The difficulty of spraying it on the engine parts.
D．It being not environment-friendly.
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单项选择题
A．It is essential to make you succeed.B．It can help a person maintain good health.C．It might prove that you are a creative person.D．It gives you a-chance to enjoy a football match.
A．It is essential to make you succeed.
B．It can help a person maintain good health.
C．It might prove that you are a creative person.
D．It gives you a-chance to enjoy a football match.
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