单项选择题

Questions 1 to 4 are based on the following talk.

A．Noise pollution.
B．Litter pollution.
C．Water pollution.
D．Air pollution.

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热门试题

单项选择题The author devoted himself to scientific studies at Los Alamos because______.

A．he appreciated its scientific environment
B．he esteemed its distinguished scientists and treasured their accomplishments
C．it obtained support from Washington
D．its leaders were all able to cope with the potential damage to its programs.

单项选择题A．The threat of poisonous desert animals and plants.B．The exhaustion of energy resources.C．The destruction of oil wells.D．The spread of the black powder from the fares.

A．The threat of poisonous desert animals and plants.
B．The exhaustion of energy resources.
C．The destruction of oil wells.
D．The spread of the black powder from the fares.

Questions 1 to 4 are based on the following talk. 您的浏览器不支持 audio 元素。

Questions 1 to 4 are based on the following talk.