题目
An estimated 30 percent of outdoor lighting—plus even some indoor lighting—is wasted. Inefficient lighting costs U. S. about $10. 4 billion a year, according to Bob Gent of the International Dark-Sky Association, a nonprofit that aims to control light pollution.
Last year in Sydney, an estimated 2. 2 million Australians switched off their lights during “Earth Hour”, briefly reducing that city’s energy use by more than 10 percent. Motivated by such trends, more than two dozen cities worldwide went dim on March 29 this year in an hour-long demonstration.
A number of groups are trying to measure light pollution and assess its effects on the environment in the hope that people will reduce their own contribution to the problem. Scientists are trying to report how many stars we can see. In dark rural areas, about 2, 000 stars are typically visible at night, compared with“maybe five”in a bright city square—and about 5, 000 in centuries past.
People who are working while others are star-gazing may face the greatest risks. Nighttime exposure to white light can cause the growth of tumors (肿瘤) , experiments show. Two decades of research indicate that women who work night shifts have unusually high rates of breast cancer.
The word“drawbacks”in the first paragraph probably means_______.
A.benefits
B.interests
C.effects
D.problems
第1题
A.It
B.As
C.That
D.What
第2题
A.It
B.What
C.Which
D.As
第3题
What do scientists say about the collision of an asteroid with Earth?
A.It is very unlikely but the danger exists.
B.Such a collision might occur once every 25 years.
C.Collisions of smaller asteroids with Earth occur more often than expected.
D.It's still too early to say whether such a collision might occur.
第4题
There was once an ______ idea that the earth was flat and motionless.
A.eternal
B.offensive
C.absurd.
D.intrinsic
第5题
What do scientists say about the collision of an asteroid with Earth?
A.It is very unlikely but the danger exists.
B.Such a collision might occur once every 25 years.
C.Collisions of smaller asteroids with Earth occur more often than expected.
D.It's still too early to say whether such a collision might occur.
第6题
What do scientists say about the collision of an asteroid with Earth?
A.It is very unlikely but the danger exists.
B.Such a collision might occur once every 25 years.
C.Collisions of smaller asteroids with Earth occur more often than expected.
D.It's still too early to say whether such a collision might occur.
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