（本小题8分）如图，在平行四边形中，点是对角线上的一点，，，垂足分别为、 ，且，平行四边形是菱形吗？这什么？
—Peter, what if your parents go out? —They ask me to _______ myself.
—Where’s her second son? I haven’t seen him for a long time. —He _______ Maine looking for a place to work.
—Are you going to Tibet for vacation? —Yes. I want you to ________ me with some information about it.
—Which province is the ________ one in winter? —It should be Hainan Province, I think.
—Do you think yesterday’s math problem was difficult? —Yes. I could ________ work it out.
中，点
是对角线
上的一点，
，
，垂足分别为
、
，且
，平行四边形
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