2. 外语
  3. Changes made to ecosystem in order to achieve a goal, such as food production or flood control, often _____ significant unforese

Changes made to ecosystem in order to achieve a goal, such as food production or flood control, often _____ significant unforese

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问题 Changes made to ecosystem in order to achieve a goal, such as food production or flood control, often _____ significant unforeseen trade-offs between other important products and service the ecosystems provide.
A. predict
B. delay
C. foretell
D. obscure
E. yield
F. engender
选项
答案E,F
解析 本题逻辑较为困难，通过分析选项入手。六选二题目通常需要填入一对同义词，本题有两对同义词：A项predict，C项foretell(预测)和E项yield，F engender(产生)。注意空格后面有unforeseen(未预料到的)一词。既然是未预料到的，前面就不能填入表示预测的词，否则会形成矛盾。因此，选E、F。
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