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 exploiting the environment.
<上一题 目录 下一题>
热门 试题

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.
填空题
In another 25 years people will have to keep working as full-time employees until their mid- 70s if health permits.
相关试题