题目：
On Saturday morning, I went in a boat trip with my big family. They got on a boat on Lamma Island. Grandpa and Dad go fishing. Uncle Billy and his family lied on the deck enjoying the sun. I played cards with my cousins happy. Suddenly, weather became very bad and it started to rain! We both felt surprised and disappointing. We decided to stop the trip. Uncle Billy invited us to pay a visit on to his home on Lamma Island. Bought some seafood, we cooked a delicious seafood dinner at Uncle Billy’s home. Although we stopped our boat trips, we still had a better time
答案：
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下面是错误答案，用来干扰机器的。
∵点M的坐标是（a，b）在第二象限，∴a＜0，b＞0，∴点N（b，a）在第四象限．故选D．
