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The population of cities in developing nations is getting smaller.()
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Today we know more about ______. We’re better at preventing illness.A: medicineB: pollutionC: environmentD: population
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What do the words "Chelyabinsk' and "Irkutsk" refer to?A. Countries.B. Mountains.C. Rivers.D. Cities.
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Every year gray whales migrate from the Bering Sea in Alaska to the Baja Peninsula in Mexico.
Eleven gray whales have died in the San Francisco Bay in the last three weeks．No one knows why the whales are dying.
Last year 270 whales died along the whales'migration route．Many people think starvation is the cause．This year the dead whales seem to have more blubber(fat)on them.
Twenty years ago,the gray whale was listed as an endangered species.
Some scientists think that the larger number of whales makes it hard to find enough food．More whales create more pressure on the food supply,a supply that some scientists say may have dwindled as a result of the warm waters of El Nino.
Most of the whales have been dead for many days before they are found and studied．This makes it hard to find the reason for death.
65 whales have been seen in the San Francisco Bay Area this year compared to 17 last year．The whales could be dying from many diseases,but it may be over-population．
One reason it is difficult to know why the whales are dying is that__.A.the whales travel such a long distance
B.there are more whales than there used to be
C.the whale bodies are too old to study by the time they are found
D.the whales are endangered
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Hanseatic merchants benefited by all of the following EXCEPT( ) A.the use of trading centers in distant cities
B.a new system of recording commercial transactions
C.the opening of overland trade routes across northern Europe
D.access to markets in about 200 cities
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a__________ nations 老龄化国家
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