What are some of the advantages of shopping and eating underground？Clean air is one of them.The city of Tokyo has one of the most serious air pollution problems in the world.Another advantage is that you escape the ever­present threat(威胁)of traffic accidents on the city's busy streets.Still another is the convenience of getting around：you are usually right next to，or even in，a subway station.And you can even spend the night underground if you like.TheKyobashi station，for example，in downtown Tokyo，has a hotel with a bar，restaurant，and barbershop.

【语篇解读】本文为说明文，介绍了日本东京的地下建筑。

16．The reason why buildings cannot be very high in Tokyo is ________.

A．that the information about high buildings is limited in Tokyo

B．that the workers haven't mastered enough modern science and technology

C．the earthquake

D．the heavy traffic

答案　C　[细节理解题。根据第1段In Japan's capital city of Tokyo，earthquake danger limits the height of buildings可知日本东京建筑高度受到限制的原因是地震。其他各项没有提到。]

17．What's the meaning of "skyrocket"？It means "______"．

A．go up sharply

B．be as high as that of a rocket

C．fall rapidly

D. be as low as that of a rocket

答案　A　[词义猜测题。可从该词的构词法来分析词义，skyrocket是个复合词，sky是"天空"之意，rocket是"火箭"之意，skyrocket就是"直线上升，迅速上涨"之意。]

18．What are the advantages of shopping and eating underground?

A．Less air pollution，the convenience of shopping.

B．Less air pollution，the convenience of shopping，and less traffic accidents.

C．Clean air and the convenience of getting around.

D．Clean air，less accidents' threat，and the convenience of getting around.

答案　D　[细节理解题。根据第2段Clean air is one of them.Another advantage is that you escape the ever­present threat of traffic accidents on the city's busy streets.Still another is the convenience of getting around可知地下购物和吃饭的好处有三：空气干净、免于交通事故的威胁和走动方便。B项中less traffic accidents不正确，故不能选用。A项和C项内容不全面，不是最佳答案，故不选。]

19．The passage mainly tells us ________.

A．the capital of Japan