下图是一个红绿色盲系谱图，用 B、b表示，请据图回答：Ⅲ8与Ⅲ9结婚所生的孩子是色盲患

He failed in the exams and only then _____ how much time he had wasted.

A．he realized

B．did he realize

C．he had realized

D．had he realized

管子割刀的型号是按（）划分的。

A、刀型（号）

B、重量

C、管子的直径

D、夹持管子的最大外径

—What do you think of her dress?

—I think it still looks quite fashionable on her,__________ it is a style of many years ago.[ ]

A. though        

B. or

C. so            

D. because

小绞车运输轨型不小于（）kg/m，要采用标准岔道，严禁使用非标准岔道。

A、18

B、26

C、22

D、30

甘露醇利尿的基本原理是 ( )

A．肾小球滤过率降低
B．水利尿
C．渗透利尿
D．尿崩症
E．囊内压升高