解析:选D。这些沙漠巨型植物已经变成了这个干燥区域的标志。根据句意可知,此处选symbol“标志”。signal“信号”;sign“征兆”;mark“记号”。
B
(2015·昆明质量检测)Thousands of years ago,it was common to see many stars in the sky.__1__,this changed with the invention of __2__.Cities have gone brighter,using more lights.And that means most people in urban areas will never see beautiful groups of stars.They will never see a __3__ night sky and never be inspired by it.
Today,people are __4__ by light—even at night time.Much of this light __5__ where it shouldn’t be—it creates light __6__.For example,a person can put a light outside to shine on his own house.But the light could be so strong that it may __7__ shine on his neighbor’s house.The __8__ light shining on the neighbor’s house is one kind of light pollution.
But is all this light really a big __9__?People need light to see,work and drive safely at night,and for many other things!But scientists say that this extra
light has proven __10__ on living creatures—animals and humans.
One kind of animal __11__ by light pollution is the bird.Many birds travel to a different area of the world to lay eggs,__12__ at night.But lights from tall buildings can __13__ the birds off their natural path.They may also crash into brightly lighted buildings,in danger of losing their __14__.
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