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.

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热门试题

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.