单项选择题

A．The first sentence in the last paragraph.B．The second……

Which sentence proves that setting the giant reflector is a delicate operation

A．The first sentence in the last paragraph.
B．The second sentence in the last paragraph.
C．The last sentence in the last paragraph.
D．The last sentence in the third paragraph.

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单项选择题What does the passage mainly discuss

A．The production of solar light and heat.
B．The physical and chemical nature of life.
C．The conversion of Hydrogen to helium.
D．Radiation in the X - ray part of the spectrum.

单项选择题According to the passage, in the late 1960s some residents 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Where in the passage does the author compare the energy consumption of skyscrapers with that of a city

A．Lines 4 - 6.
B．Lines 7 - 10.
C．Lines 12 - 14.
D．Lines 15 - 16.

单项选择题The main purpose of the passage is to ______.

A．compare skyscrapers with other modern structures
B．describe skyscrapers and their effect on the environment
C．advocate the use of masonry in the construction of skyscrapers
D．illustrate some architectural designs of skyscrapers

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.