2. 考研
  3. Imagine fishermen walking down to the seashore, ready to carry out their early morning routine of preparing their boats and net.

Imagine fishermen walking down to the seashore, ready to carry out their early morning routine of preparing their boats and net.

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问题     Imagine fishermen walking down to the seashore, ready to carry out their early morning routine of preparing their boats and net. 【B1】______ they hope for a good catch of fish. But to their 【B2】______ , a horrible sight meets their still sleepy eyes. Thousands of fish have washed 【B3】______ dead. The cause of this mass destruction? A red tide!
    Red tides are a global 【B4】______ . They have been observed on both the Atlantic and the Pacific coasts of the United States and Canada. They have also 【B5】______ in many other places. Though relatively few people are 【B6】______ them, red tides are not new.
    In the Philippines, a red tide was first seen in the province of Bataan in 1908. Since then, red tides have been seen in many other 【B7】______ . A Philippines red tide expert told us that" 【B8】______ the fish kills, the Philippines has documented 1,926 cases of dead shellfish poisoning caused by red tides".
    The term "red tide" 【B9】______ the discoloration of water that sometimes occurs in certain areas of the ocean or sea. Although the color is often red, it may also be 【B10】______ of brown or yellow. The World Book Encyclopedia reports that "the discolored areas may range from 【B11】______ a few square yards to more than 2,600 square kilometers".
    What causes such discoloration? Red tides are generally caused by several 【B12】______ of single-celled organisms. These tiny organisms have hair-like projections which they use to 【B13】______ themselves in water. There are about 2,000 varieties of these organisms, 30 of which carry poisonous 【B14】______ . These minute organisms usually stay in warm waters with high content of salt.
    A red tide occurs when there is a sudden and rapid 【B15】______ of these organisms. The concentration of these organisms may 【B16】______ to 50,000,000 per quart of water! Although scientists do not fully understand why this happens. It is known that these organisms 【B17】______ when certain conditions simultaneously affect the water. These include abnormal weather, 【B18】______ temperatures, an oversupply of nutrients in the water, a generous 【B19】______ sunlight, and favorable water currents. When a heavy rainfall occurs, minerals and other nutrients are sometimes washed 【B20】______ the land into coastal waters. These nutrients can contribute to the breeding of the organisms. The result? Red tides!
选项 A、As a result
B、As it is
C、As expected
D、As usual
答案D
解析 这里表示“像往常一样”。C项的意思与hope重复；A项和B项不合题意。
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