精选优质文档-倾情为你奉上一、单项填空(从题中所给的A、B、C、D四个选项中，选出最佳选项)1.A huge amount of environmental damage has been _ by the destruction of the rainforests.A. brought in B. brought upC. brought about D. brought down【答案】C【解析】bring in收获，得到，引进；bring up提出，抚养，教育；bring about引起，实现，导致，带来；bring down降低。句意：对热带雨林的破坏给环境带来了很大的危害。2.The two Chinese scientists have made a wonderful discovery, which marks a major _ in the basic research in the field.A. boomB. businessC. burden
