题目内容
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Because of air pollution being greatly reduced, this city is still ______.
A．a good place in which to live
B．a good place to live in
C．lived as a good place
D．living in as a good place
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更多“Because of air pollution being…”相关的问题
Because of the reduction of air pollution, this city now is a good place _______
A．where to live
B．which to live
C．to be lived
D．to live
There would be no air pollution to this city because ______.
A．there was a special plant to treat the polluted air
B．the city was away from the mainland
C．people in the city did not burn oil or coal
D．vehicles there were powered by electricity
After September 11, long delays of express air shipping often arise because of
A．stricter security regulations enforced.
B．higher payment imposed on customers.
C．stiff competition coming from trucks.
D．failure to cater to customers' needs.
Air pollution is the most serious kind of pollution because ______.
A．it's bad for all living things in the world
B．it makes much noise
C．it makes our rivers and lakes dirty
D．it makes us angry more easily
The assumption of the future is not all hot air because
A．Marconi made a profound change in the past.
B．the wireless technology will change everything.
C．the possibility of wireless technology is justified.
D．the wireless technology is already sophisticated.
A.press
B.pressing
C.pressure
D.expression
Air is (1)_____, and like all matter, it has weight. Weight is the measure of the (2)_____ of gravity (3)_____ matter. If a scale registers 10 kilograms when a stone is placed on it, this means that gravity pulls the stone with that (4)_____ force. (5)_____, earth's gravity pulls on each (6)_____ of gas and dust on the atmosphere. Because our atmosphere is a. vast (7)_____ of air, it has (8)_____. If it could (9)_____ be compressed and put on a (10)_____ of scales, it would weigh about 5,700,000,000,000,000 (quadrillion) metric tons.
The air pressed down on us and against us (11)_____ all sides. Something (12)_____ a ton of air is pressing against you at this moment. You are not (13)_____ of this because air pressure within your body (14)_____ the pressure of the air outside.
Air pressure is 1.036 kilograms per square centimeter (14.7 pounds per square inch) at sea (15)_____. It is greatest there because that is the (16)_____ of the atmosphere. (17)_____ higher altitudes the pressure is (18)_____. That is why the (19)_____ of highflying planes are pressurized. They are designed to (20)_____ the air pressure our bodies must have.
A．thing
B．material
C．atmosphere
D．matter
The group of boys had to stop because ______.
A．they had reached the peak
B．one of the boys was badly injured
C．one of the boys was sick
D．they had to return to the hut
According to the writer, the main problem to our environment today is______.
A．the increase of population
B．the limited energy resources
C．the more serious air pollution
D．the development of technology
Text 3
Under certain circumstances, the human body must cope with gases at greater-than-normal atmospheric pressure. For example, gas pressures increase rapidly during a dive made with scuba gear because the breathing equipment allows divers to stay underwater longer and dive deeper.
The pressure exerted on the human body increases by 1 atmosphere for every 10 meters of depth in seawater, so that at 30 meters in seawater a diver is exposed to a pressure of about 4 atmospheres. The pressure of the gases being breathed must equal the external pressure applied to the body, otherwise breathing is very difficult. Therefore all of the gases in the air breathed by a scuba diver at 40 meters are present at five times their usual pressure. Nitrogen, which composes 80 per cent of the air we breathe, usually causes a balmy feeling of well-being at this pressure. At a depth of 5 atmospheres, nitrogen causes symptoms resembling alcohol intoxication, known as nitrogen narcosis. Nitrogen narcosis apparently results from a direct effect on the brain of the large amounts of nitrogen cause under these pressurized helium does not exert a similar narcotic effect.
As a scuba diver descends, the pressure of nitrogen in the lungs increases. Nitrogen then diffuses from the lungs to the blood, and from the blood to body tissues. The reverse occurs when the diver surfaces; the nitrogen pressure in the lungs falls and the nitrogen diffuses from the tissues into the blood, and from the blood into the lungs. If the return to the surface is too rapid, nitrogen in the tissues and blood cannot diffuse out rapidly enough and nitrogen bubbles are formed. They can cause severe pains, particularly around the joints.
Another complication may result if the breath is held during ascent. During ascent from a depth of 10 meters, the volume of air in the lungs will double because the air pressure at the surface is only half of what it was at 10 meters. This change in volume may cause the lungs to distend and even rupture. This condition is called air embolism. To avoid this event, a diver must ascend slowly, never at a rate exceeding the rise of the exhaled air bubbles, and must exhale during as- cent.
31. What does the passage mainly discuss？
A) The equipment divers use.
B) The effects of pressure on gases in the human body.
C) How to prepare for a deep dive.
D) The symptoms of nitrogen bubbles in the bloodstream.
