我国票据法不允许______。( )
A．自由承兑 B．完全承兑C．单纯承兑 D．不单纯承兑
参考答案：D
He was wearing his dark glasses to _____ his eyes from the strong sunlight. [ ]
A. defend
B. protect
C. prevent
D. stop
几种实验动物的一次灌胃容量范围正确的是（）
A.小鼠0.1ml/100g～0.5ml/100g
B.大鼠1ml/10g
C.家兔<5ml/kg
D.狗<50ml/kg
E.以上均正确
