危险化学品的包装标签上要印有警示性标志。下列物质选用“腐蚀品”标志的是（ ）
A．汽油
B．食盐
C．浓硫酸
D．炸药
答案：C
— How are the things in your village?
— Modern farming methods have been brought in and the villagers are _____ now than before. [ ]
A. well off
B. better off
C. badly off
D. worse off
