Climate change is one of the most fundamental challenges ever to confront humanity. Its impacts are already showing and will intensify over time __21__ left unchecked. There is overwhelming scientific evidence, __22__ shown in the Fourth Assessment Report (第四次评估报告的综合报告)of the Intergovernmental Panel on Climate Change (IPCC) 政府间气候变化专门委员会(IPCC), that climate change will threaten __23__ growth and long-term prosperity, as well as the very survival of the most vulnerable populations. IPCC projections indicate that if emissions continue to rise at their current __24__ and are allowed to double from their pre-industrial level, the world will face an average temperature__25__ of around 3°C this century. Serious impacts are associated __26__ this scenario (情景), including sea-level rise, shifts in growing seasons, and an __27__ frequency and intensity of extreme weather events such as storms, floods and droughts.

　　The United Nations Climate Change Conference in Copenhagen in December in 2009 offers a __28__ opportunity to step up international action on climate change. A Copenhagen deal is __29__ the global transition into green economic growth, and, most urgently, to help the world, especially the most vulnerable, to adapt to impacts __30__ are now inevitable.

　　(1)、

　　A：if

　　B：whether

　　C：when

　　D：which

　　答案： A

　　(2)、

　　A：because

　　B：as

　　C：while

　　D：when

　　答案： B

　　(3)、

　　A：economics

　　B：economical

　　C：economy

　　D：economic

　　答案： D

　　(4)、

　　A：speed

　　B：rate

　　C：pace

　　D：rhythm

　　答案： C

　　(5)、

　　A：rising

　　B：rise

　　C：raise

　　D：raising

　　答案： B

　　(6)、

　　A：with

　　B：to

　　C：from

　　D：in

　　答案： A

　　(7)、

　　A：being increased

　　B：increased

　　C：increase

　　D：increasing

　　答案： D

　　(8)、

　　A：history

　　B：historical

　　C：historic

　　D：historically

　　答案： B

　　(9)、

　　A：necessary

　　B：inevitable

　　C：essential

　　D：basic

　　答案： C

　　(10)、

　　A：that

　　B：of which

　　C：who

　　D：what

　　答案： A