六年级有男生64人，女生48人。男生和女生的人数比是（ ），女生与六年级总人数的比是（ ）。
4：3；3：7
— Isn't it a surprise that I happened to meet Emily at Doris' birthday party last weekend?
— If my memory serves me correctly, you _________ each other for exactly three years. [ ]
A. hadn't seen
B. haven't seen
C. didn't see
D. don't see
差点、差距整治攻关局立项目，达到整治目标后，及时向机务处申请（）。
A、成果奖励
B、审查验收
C、项目资金
D、审查鉴定
