某ICU共有10张床位，则该ICU总面积至少应为（）
A.500m2
B.100m2
C.150m2
D.200m2
E.300m2
参考答案：D
40是50的______%；40比50少______%；30比______少25%．
Many road accidents occurred because motorists could not ________ the speed of approaching vehicles.[ ]
A. conclude
B. count
C. measure
D. value
