单项选择题

Questions 23 to 25 are based on the conversation you have just heard.

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 exptoiting the environment.
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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．They carried passengers, but not cargo.B．They were large, but surprisingly fast.C．They were the first successful steam-powered ships.D．They were more reliable than other ships of the 1860’s.
A．They carried passengers, but not cargo.
B．They were large, but surprisingly fast.
C．They were the first successful steam-powered ships.
D．They were more reliable than other ships of the 1860’s.
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