完形填空!急等!Climate change is one of the most fundamental challe

完形填空!急等!
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.
单选题
A.A.if
B.B.whether
C.C.when
D.D.which
单选题
A.A.because
B.B.as
C.C.while
D.D.when
单选题
A.A.economics
B.B.economical
C.C.economy
D.D.economic
单选题
A.A.speed
B.B.rate
C.C.pace
D.D.rhythm
单选题
A.A.rising
B.B.rise
C.C.raise
D.D.raising
单选题
A.A.with
B.B.to
C.C.from
D.D.in
单选题
A.A.being increased
B.B.increased
C.C.increase
D.D.increasing
单选题
A.A.history
B.B.historical
C.C.historic
D.D.historically
单选题
A.A.necessary
B.B.inevitable
C.C.essential
D.D.basic
单选题
A.A.that
B.B.of which
C.C.who
D.D.what

A
B
C
A
B
A
C
C
C
D