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【简答题】
已知抛物线C的顶点在原点，焦点为F（0，1），且过点A（2，t）， （I）求t的值； （II）若点P、Q是抛物线C上两动点，且直线AP与AQ的斜率互为相反数，试问直线PQ的斜率是否为，若是，求出这个值；若不是，请说明理由．
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【简答题】A freight forwarder is also called（ ）．
【简答题】A freight forwarder is also called（ ）．
【简答题】In a database, columns are also called ________, rows are also called ________
【单选题】Paifang, also called pailou is an archway usually made of wood and stone, well painted and with glazed tiles sometimes, and it has many different functions except for ____________.
A.
commemorating historical event
B.
commending the persons with a high moral quality
C.
celebrating the important festival
D.
honoring the persons with the remarkable achievements
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