Since the early 1990s, conservationists have______protecting the Amazon in part

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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

解析四个选项的意思分别是：call forth使产生，引起，使起作用；call back叫回来，收回，打回电；call up召唤，使想起，提出；call for要求，提倡，为……叫喊。句意是，由于植物和动物物种丰富，自从20世纪90年代起，环境保护论者就一直呼吁保护亚马逊丛林。

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