院前急救处理病人时遵循从（）的顺序最为可靠。
A、身躯到四肢
B、头到脚
C、个人习惯
参考答案：B
— I don't want to move to that city. It is heavily polluted.
— Pollution is common. The city here is ________. [ ]
A. no less clean
B. not cleaner
C. no cleaner
D. not less clean
某金属放在稀硫酸中，不产生气泡，该金属可能是[ ]
A．Cu
B．Zn
C．Al
D．Mg
