He needs his homework this evening . [ ]
A . do
B. does
C. doing
D. to do
答案:A
在平面内画两条______、______ 的数轴,就组成了平面直角坐标系.
前列腺素衍生物Latanoprost(适利达)的降眼压机制是()
A.减少房水分泌
B.开放小梁网
C.浓缩玻璃体
D.增加巩膜葡萄膜通道房水外流
E.增加视网膜脉络膜通道房水外流