对于古埃及的农民来说，_______尼罗河泛滥的规律是性命攸关的大事，因此他们_______着去计算天数，小心地记录日期。他们把月亮和星星作为日历，当天狼星在夏天升起的时候，古埃及人知道尼罗河就要泛滥了;接着当新月时候，就是古埃及新一年的开始。 依次填入划横线部分最恰当的一项是：

A.揭示 尝试 

B.遵循 坚持 

C.总结 学习 

D.掌握 摸索

Man: Have you run up against any problems in getting your passport renewedWoman: I haven't started the plan yet.Question: What do know from the conversation

A．The woman doesn't think it a problem to get her passport renewed.

B．The woman has difficulty renewing her passport.

C．The woman hasn't renewed her passport yet.

D．The woman's passport is still valid.