I’m moving to the countryside because the air there is much fresher
than in the city.
A. ones
B. one
C. that
D. those
网友回答
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。