单项选择题

According to the passage, what is one disadvantage of skyscrapers that have mirrored walls

A．The exterior surrounding air is heated.
B．The windows must be cleaned daily.
C．Construction time is increased.
D．Extra air-conditioning equipment is needed.

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单项选择题

According to the passage, in the late 1960' s some inhabitants of Boston were concerned with which aspect of skyscrapers

A．The noise from their construction.
B．The removal of trees from building sites.
C．The harmful effects on the city's grass.
D．The high cost of rentable office space.

单项选择题

What will the Bristol team support

A．Benefits of sunshine outweigh the risk of skin cancer.
B．People should spend less time in the sun.
C．Sunshine does more harm than good to skin.
D．Most of the skin disease are fatal.