I’m moving to the countryside because the air there is much fresher thanin the city.A. one

问题补充：

I’m moving to the countryside because the air there is much fresher

thanin the city.

A. ones

B. one

C. that

D. those

答案：

A. ones

B. one

(答案→)C. that

D. those

解析：考察代词。That指代上文提及的不可数名词或者可数名词单数形式，后面有定语修饰，表示特指。本题的That指代air,后面有定语in the city修饰，故C正确。句意：我要搬到乡下去住，因为那里的空气要比城里的空气要更新鲜。