A warm thought suddenly ____ to me ____ I might use the pocket money to buy some flowers for

my mother's birthday. [ ]

A. occurred, if      

B. crossed, when    

C. came, that     

D. struck, that

正常人的暗适应时间为（）

A.16～20分钟

B.10～15分钟

C.6～8分钟

D.1～2小时

E.<5分钟