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  3. In fisheries in general, when a large harvest is taken one year, there will be fewer fish available to be harvested in the follo

In fisheries in general, when a large harvest is taken one year, there will be fewer fish available to be harvested in the follo

admin2011-01-20  61
问题 In fisheries in general, when a large harvest is taken one year, there will be fewer fish available to be harvested in the following year, leading to decreasing yields of most fish species over time. The Maine lobster is an anomaly, however. Even though the vast number of lobster traps covering the New England coast pull in more lobsters every year, the number of lobsters in the water has shown no signs of decreasing.    Which of the following, if true, most helps to explain the apparent anomaly concerning the number of Maine lobsters?
选项 A、The decline of other fish species in the region has deprived the lobster of its natural food source of scavenged fish.
B、The bait in lobster traps provides abundant food for young lobsters, which are still small enough to swim out of the traps, leading to much higher survival rates among young lobsters than would be expected in nature.
C、As global warming heats the waters of the Atlantic coastline, the Maine lobster has extended its northern range to well past Nova Scotia.
D、The ever-increasing demand for lobsters in seafood restaurants and steakhouses across the country has driven a corresponding increase in the supply of the product.
E、The increased lobster harvest has resulted in many juvenile lobsters but very few breeding-age lobsters, which could result in a crash in lobster numbers in the near future.
答案B
解析 Answer B provides an explanation--the food in lobster traps leading to a higher survival rate among young lobsters--for the apparent anomaly that the lobster harvest can increase every year without decreasing the total population of lobsters.
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