更多"It is important that the problems o"的相关试题:
[多项选择]Water Problems
Where’’s the water
Water. If you’’ve got it, you probably take it for granted. But a quick look at the globe — and a chat with the tiny group of researchers who are worrying about fresh water — both indicate that water shortages are very serious.
And they aren’’t necessarily in the future, either. Here’’s what we’’ve read in the past week or so.
... Mexico City (home to 20 million people) is sinking because the city sucks out underground water faster than the aquifer can be refilled.
... Florida wants to refill its overpumped aquifer (蓄水层) with untreated surface water, despite federal regulations to the contrary.
... Texas is moving toward private, for-profit water sales. The water will be "mined" from aquifers that are disappearing fast. No word on what the private suppliers, including corporate raider T. Boone Pickens, will do once the aquifers run dry.
... Aquifers around the world are being overtapped for irrigated agriculture, which f
[单项选择] Water Problems
Where’’s the water
Water. If you’’ve got it, you probably take it for granted. But a quick look at the globe — and a chat with the tiny group of researchers who are worrying about fresh water — both indicate that water shortages are very serious.
And they aren’’t necessarily in the future, either. Here’’s what we’’ve read in the past week or so.
... Mexico City (home to 20 million people) is sinking because the city sucks out underground water faster than the aquifer can be refilled.
... Florida wants to refill its overpumped aquifer (蓄水层) with untreated surface water, despite federal regulations to the contrary.
... Texas is moving toward private, for-profit water sales. The water will be "mined" from aquifers that are disappearing fast. No word on what the private suppliers, including corporate raider T. Boone Pickens, will do once the aquifers run dry.
... Aquifers around the world are being overtapped for i
A. Y
B. N
C. NG
[填空题]In my opinion, it is important that the water (clean) ______before we use it.
[填空题]The problems Americans face concerning water are ground water shrinkage and tap water pollution.
[简答题] WATER
The second most important constituent of the biosphere is liquid water. This can only exist in a very narrow range of temperatures, since water freezes at 0℃ and boils at 100℃. This is only a tiny range compared with the low temperatures of some other planets and the hot interior of
the earth, let the temperature of the sun. (1)__________
As we know, life would only be possible on the face (2)__________
of a planet had temperatures somewhere within this range. (3)__________
The earth’’s supply of water probably remains quite fairly (4)__________
constant in quantity. A certain number of hydrogen atoms,
which are one of the main constituents of water,
are lost by escaping from the atmosphere to
out space, but they are probably just about replaced by (5)__________
new water rising away from the depths of the earth during (6)__________
volcanic action. The total quantity of water is not known,
and it is about enough to cover