问题详情

It can be concluded that ______ .
A．raising the world"s temperature only a few degrees would not do much harm to life on earth.
B．lowering the world"s temperature merely a few degrees would lead major fanning areas to disaster.
C．almost no temperature variations have occurred over the past decade.
D．the world"s temperature will remain constant in the years to come.请帮忙给出正确答案和分析，谢谢！