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．Students might not consider them to be an important part of culture.B．They symbolize the rebellion of youth in the 1950’s.C．They are discussed in the students’ textbook.D．They have been worn for hundreds of years.
A．Students might not consider them to be an important part of culture.
B．They symbolize the rebellion of youth in the 1950’s.
C．They are discussed in the students’ textbook.
D．They have been worn for hundreds of years.
单项选择题
A．They were protected by a strong United States Navy.B．They were supported by a well-developed railroad.C．Most crew members had experience on foreign ships.D．As part owners of the ships, captains got some of the profits.
A．They were protected by a strong United States Navy.
B．They were supported by a well-developed railroad.
C．Most crew members had experience on foreign ships.
D．As part owners of the ships, captains got some of the profits.
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