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【简答题】
如图，以等边△OAB的边OB所在直线为x轴，点O为坐标原点，使点A在第一象限建立平面直角坐标系，其中△OAB边长为6个单位，点P从O点出发沿折线OAB向B点以3单位/秒的速度向B点运动，点Q从O点出发以2单位/秒的速度沿折线OBA向A点运动，两点同时出发，运动时间为t（单位：秒），当两点相遇停止。 （1）点A坐标为_____________，P、Q两点相遇时交点的坐标为________________； （2）当t=2时， ____________；当t=3时， ____________； （3）设△OPQ的面积为S，试求S关于t的函数关系式； （4）当△OPQ的面积最大时，试求在y轴上能否找一点M，使得以M、P、Q为顶点的三角形是Rt△，若能找到请求出M点的坐标，若不能找到请简单说明理由。
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举一反三
【单选题】Listen to a long conversation and choose the best answer to each question you hear.
A.
to make him feel better after he lost the first prize
B.
to apologize for not buying him some ice cream
C.
to wish him good luck in the next competition
D.
to congratulate him on winning the first prize
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【单选题】Listen to a long conversation and choose the best answer to each question you hear.
A.
To make him feel better after he lost the first prize.
B.
To apologize for not buying him some ice cream.
C.
To wish him good luck in the next competition.
D.
To congratulate him on winning the first prize.
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