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Questions 21 to 23 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions. Now listen to the news. Officials say water levels along the Brahmaputra River still are at dangerous levels although ______.
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The glaciers that reached the Pacific Coast were valley glaciers, and between those tongues of ice ______ that allowed the original forests to survive.
Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. The teachers mainly teach ______ in universities.
Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. What is the average age of a game player
( )利用前药修饰原理，消除不适宜的制剂性质。
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