题目

The Arctic will soon be free from ice, experts say. The change is bound to take place, but the global warming and climate change are changing the earth’s landscape (地形) rapidly，causing panic worldwide.    Experts say that the Arctic sea ice is melting (融化) quite faster than expected and it can affect not just the region, but Earth in general. A scientist even says that next year, or maybe the year after that, the Arctic will be free of ice.     Peter Wadhams, a scientist, said that the melting trend led to his statement. “Most people expect this year will see a reco用pH试纸测下列溶液的酸碱性，常温下大于7的一种是（ ）A.KNO3B.NH4ClC.CuSO4D.CH3COONa