2. 外语
  3. Since the early 1990s, conservationists have______protecting the Amazon in part because of its abundance of plant and animal spe

Since the early 1990s, conservationists have______protecting the Amazon in part because of its abundance of plant and animal spe

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问题 Since the early 1990s, conservationists have______protecting the Amazon in part because of its abundance of plant and animal species.
选项 A、called forth
B、called back
C、called up
D、called for
答案D
解析 各项的意思是：call forth引起，唤起；call back召回；call up召集，动员；call for呼吁。
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