单项选择题

Questions 31 to 33 are based on the passage you have just heard.
（）

A．When the system is down.
B．When the URL is reused.
C．When new links are set up.
D． When the server is restarted.

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热门试题

单项选择题

The author believes the most effective method to solve the pension crisis is to （）

A．allow people to work longer
B．cut back on health care provisions
C．increase tax revenues
D．start reforms right away

单项选择题

（）

A． It collapsed at least once in the past 1.3 million years.
B．It sits firmly on solid rock at the bottom of the ocean.
C．It melted at temperatures a bit higher than those of today.
D．It will have little impact on sea level when it breaks up.

Questions 31 to 33 are based on the passage you have just heard. （）

Questions 31 to 33 are based on the passage you have just heard.
（）