妙用空调可节能。空调制冷时，室温调高（）℃，制热时，室温调低（）℃，均可省电10％以上。
A.1，2
B.2，1
C.1，1
D.2，2
参考答案：B
Don’t make so much noise. The children an English lesson.
A. have B. are having C. were having
低压气有何作用？
