单项选择题

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

A．The high temperatures required for its use.
B．The lack of trained environmental engineers.
C．The opposition of automobile manufacturers.
D．The high cost of materials used in its production.
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单项选择题
A．He plans to sell the books to a collector.B．The old books are worth a lot to collectors.C．He won’t sell the books until he has read them.D．The books probably aren’t worth much in terms of money.
A．He plans to sell the books to a collector.
B．The old books are worth a lot to collectors.
C．He won’t sell the books until he has read them.
D．The books probably aren’t worth much in terms of money.
单项选择题
A．Because every species becomes extinct.B．Because humans beings are powerful enough to kill other species.C．Because of over-population.D．Because human being is still a young species though it is exploiting the environment.
A．Because every species becomes extinct.
B．Because humans beings are powerful enough to kill other species.
C．Because of over-population.
D．Because human being is still a young species though it is exploiting the environment.
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