题目内容：
Warming in the Northern Hemisphere was large in ________ at middle and high latitudes.
A
produces much more global warming than a carbon-dioxide forcing of the same magnitude
B
contributed to 25 percent of observed global warming
C
winter and spring
D
the warming effects increase
E
still surpass soot warming the world's climate during the last century
F
can be seen mostly in the Northern Hemisphere
答案解析：