Which of the following is mentioned as one of the reasons for the dwindling West African rainforest?

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问题 Which of the following is mentioned as one of the reasons for the dwindling West African rainforest?
  
In West Africa, the Guinean Rainforest is rapidly disappearing. A new study says increased production of cocoa, cassava and oil palm has meant more land is being cleared for agriculture. This could have major long-term consequences for climate change and food security.
    Since the days of independence, West Africa has done a pretty good job of feeding itself. But scientist James Gockowski said that success has come at a terrible price, the loss of vast areas of rainforest.
    It’s estimated only 15 to 20 percent of the rainforest that once stretched across coastal West Africa is still standing. And most of that is in protected areas, such as parks and forest reserves. The loss has meant biodiversity extinction.
    One primate that has become extinct is Colobus Monkey. It hasn’t been sighted since the late 1970s and was declared extinct in 2000.

选项 A、Only 15%~20% of the rainforest is still standing.
B、Only 5%~15% of the rainforest is still standing.
C、Only 50%~70% of the rainforest is still standing.
D、Only 15%~30% of the rainforest is still standing.

答案A

解析
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