问题
Thelack of eco-friendly habits among the public is thought to be a major _____ofglobal climate change
A:some of them measures over 50 meters
B:some of which measuring over 50 meters
C:some of them measuring over 50meters
D:some of which measures over 50meters
B:some of which measuring over 50 meters
C:some of them measuring over 50meters
D:some of which measures over 50meters
正确答案是：
