①某公司生产该商品的劳动生产率提高了50%，若其他条件不变，则2017年该商品的价格为150元。

②纸币的发行量增加了一倍，若其他条件不变，则2017年该商品的价格为150元。

③若其他条件不变，则2017年该商品的价值总量减少一半。

④该国货币贬值20%，若其他条件不变，则2017年该商品的价格为187．5元。

已知A（1，0），B（0，2），点P在x轴上，且△PAB面积是5，则点P的坐标是____ 

    One day, Allan and his friend Henry went swimming in a river. It was very hot. How happy they were in the river! After they got out of the water, they played games in the sun for a while.
    On their way back, Henry saw some flowers. He liked flowers very much and ran into the green field to look at them. Now Allan was walking by himself.
    Then he heard Henry calling out, "A snake（蛇）! Help!..."
    "What's wrong with you?" asked Allan.
    "A snake bit（咬）me in the leg. Come here!"
    Allan ran over and saw a small red wound（伤口）on Henry' s leg.
    "The snake was in the grass. I didn't see it."
    "Sit down quickly"! Allan told Henry.
    Allan put his mouth at the little red wound and began to suck（吸）at it. In this way he saved （挽救）Henry's life. "Oh, Allan, it's very kind of you to help me."
    "That's all right. We are friends and we must always help each other."