A:人们在自然灾害面前是无能为力的
B:科学技术发展是战胜自然灾害的唯一因素
C:规律是客观的,人们可以创造和改变规律
D:人们可以认识和利用规律,造福人类
I didn't do very well in this exam. Unluckily, he did it .
—______. You didn't mean to, did you?
北回归线自东向西穿过的我国四个省(区)是( )