二、单项选择（共15小题；每小题1分，满分15分）
第一节 单项选择（共15小题；每小题1分，满分15分）
26．—Do you do any sports now？
—Yes, all of us exercise at ______ least ________ hour a day in and outside school.
A．the; a B．a; an C．/; a D．/; an
27．—Is it cold in winter here？
—No, it isn’t. The temperature normally stays _________ zero.
