摘要：At what time of the school term does the conversation most probably take place? A.At the end of it. B.In the middle of it. C.At the beginning of it.
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A semipro baseball league has teams with 21 players each. League rules state that a player must be paid at least ＄15，000，and that the total of all players’ salaries for each team cannot exceed ＄700，000. What is the maximum possible salary，in dollars，for a single player？
A. 270，000 B. 385，000 C. 400，000 D. 430，000 E.700，000
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已知△ABC的边AB所在直线的方程为x-3y-6=0，M（2，0）满足| BM |
| MC |
| AT |
| AB |
（1）求△ABC外接圆的方程；
（2）一动圆过点N（-2，0），且与△ABC的外接圆外切，求此动圆圆心的轨迹方程Γ；
（3）过点A斜率为k的直线与曲线Γ交于相异的P，Q两点，满足
| OP |
| OQ |
17、如图，四边形ABCD内接于⊙O，AB=BC．AT是⊙O的切线，∠BAT=55°，则∠D等于