What do you usually eat __________ breakfast?[ ]
A. for
B. of
C. to
答案：A
The figure above shows the dimensions ofa rectangular board that is to be cut into four identical pieces by making cuts at points A, B, and C, as indicated. If x=45, what is the length of AB ？(1 foot=12 inches)
温度对氯气消毒的效果，说法错误的是（）
A.高温时效果好
B.低温时效果好
C.温度的高低没有影响
D.温度的影响不确定
