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【单选题】

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.
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.In 2009, how many countries were planting genetically engineered crops

A.
96.
B.
80.
C.
25.
D.
7.
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参考答案:
参考解析:
.
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