(46) Physical changes—including rising air and seawater temperatures and decreasing seasonal ice cover—appear to be the cause of a series of biological changes in the northern Bering Sea ecosystem that could have long-range and irreversible effects on the animals that live there and on the people who depend on them for their livelihoods. In a paper published March 10 in the journal Science, a team of U.S. and Canadian researchers use data from long-term observations of physical properties and biological communities to conclude that previously documented physical changes in the Arctic in recent years are profoundly affecting Arctic life.
The northern Bering Sea provides critical habitat for large populations of such as sea ducks, gray whales, bearded seals and walruses, and all of these mammals depend on small bottom-dwelling creatures for sustenance. These bottom-dwellers, in turn, are accustomed to colder water temperatures and long periods of extensiv
Television, it is often said, keeps one (36) about current events, allows one to follow the (37) development in science and politics, and (38) an endless series of programs which are both (39) and stimulating. The most distant (40) and the strangest customs are brought right (41) one’s sitting-room. It could be argued that the radio performs this (42) just as well, but on television everything is much more living, much more (43) . Yet here is a danger. The television screen itself has a terrible, almost physical fascination for us. We get (44) used to looking at its movements, so (45) on its flickering pictures, that it begins to (46) our lives. A friend of (47) told me the other day that his television set had broken 48 and that he and his family had suddenly found that they had far more time to do things, and that they had (49) begun to talk to each other again. It makes one
A. down
B. up
C. off
D. out
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