防止CO中毒是生活中防中毒的重点。
参考答案：对
— How do you go to school?
— I live near school. I _____. [ ]
A. go to school by train
B. go to school by plane
C. go to school by taxi
D. walk
夏朝受到的来自周边地区的威胁，更多的是来自于（）。
A、南方
B、北方
C、中部
D、东方
