问题
选择题
—How about the pollution in the countryside?
—Luckily, it's not as serious as _______ in the big cities.
A．that
B．it
C．one
D．those
答案
答案：A
题目分析： A.that 代词，代指前文中出现的不可数名词 B.it 代词，代指前文中出现的事物C. one 代词，代指可数名词单数 D.those代指可数名词的复数。本题中pollution为不可数名词，故选A。