集合P={﹣1，0，1}，Q={y|y=cosx，x∈R}，则P∩Q=（   ）

甲、乙两人同时从同一起跑线出发，同向做匀速直线运动，某时刻他们的位置如图所示，下列能正确反映两人运动距离与时间关系的是

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在同一平面直角坐标系中，函数y=x﹣1与函数$y=\frac{1}{x}$的图象可能是(   )

阅读，选择

    Halloween is a very popular holiday in North America. People celebrate it on October 31st. On this day, many people decorate their houses. Many people like to make jack-o'-lanterns. They are made from pumpkins. Some jack-o'-lanterns are funny and some are scary!

    Children wear costumes and go trick-or-treating to collect candy. Many of these costumes are scary! Witch, ghost, vampire and black cat costumes are popular.

仙游度尾文旦柚，是莆田四大名果之一，获得“国家地理标志保护产品”。近年来，在政府的指导下，该地果农大力种植文旦柚，取得了较好的经济收入。某果园有130棵柚子树，每棵树结150个柚子，现准备多种一些柚子树以提高果园产量，但如果多种树，那么树之间的距离和每一棵树所接受的阳光就会减少,根据经验估计，每多种一棵树，平均每棵树就会少结1个柚子。假设果园多种了x棵柚子树．