单项选择题

According to the author, the importance of green-space in the urban environment______.

A．is still unknown
B．is usually neglected
C．is being closely studied
D．has been fully recognized
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单项选择题
What might avert the danger of the building up of a high concentration of aerosols
A．Nuclear power.
B．Fossil fuels.
C．Carbon dioxide.
D．Atom bombs.
单项选择题
How would the increasing area of ice itself lower the temperature of the planet
A．By absorbing more and more particles.
B．By reflecting much of the sun's heat.
C．By attracting more and more travelers.
D．By increasing the carbon dioxide content of the atmosphere.
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