最适合18个月小儿的体育运动方式是()
A．模仿操
B．主动操
C．被动体操
D．广播体操
E．田径活动
参考答案：A
下列药物中，主要由肝脏清除的药物是
A．氯霉素
B．万古霉素
C．克林霉素
D．林可霉素
E．大环内酯类的酯化物
A decorator bought a bolt of defective cloth that he judged to be usable, in which ease the cost would be $0.80 per usable yard. If it was later found that only of the bolt could be used, what was the actual cost per usable yard ？（）
A.$0.60
B.$0.90
C.$1.00
D.$1.20
E.$1.70
usable, in which ease the cost would be $0.80 per usable yard. If it was later found that only 
of the bolt could be used, what was the actual cost per usable yard ？（）