题目

如图甲所示，质量为m = 0.5kg，初速度v0= 10 m/s的物体，受到一个与初速度v0方向相反的外力F作用，沿粗糙的水平面滑动，物体与地面间的动摩擦因数为μ，经3 s后撤去外力，直到物体停止。整个过程物体的v－t图像如图乙所示 (g＝10m/s2)。 则 A、0～7s内物体做匀减速直线运动 B、外力F和动摩擦因数μ大小分别为0.5N和0.1 C、0～7s内物体由于摩擦产生的热量为25J D、运动到停止物体滑行的总位移为29 m  　　It is a lovely day. Pierre is a Frenchman and he only knows little English. Now he is sitting by the window of a restaurant in London. He hears someone shouting,“Look out!”He puts his head out of the window to see what is happening. At this time a basin of dirty water pours over his head, then another. 　　“Damn you! See what you have done to me!”Pierre says angrily. Some men sitting next to him laugh and Pierre gets even angrier.“What are you laughing at?”he shouts. One of the men answers,“You must be a foreigner. 'Look out'means'be careful'.” (1)Pierre puts his head out of the window to see ___ . [　　] A．who tells him to do so B．what is happening C．who pours dirty water D．who is calling him (2)What makes Pierre shout angrily? [　　] A．A man pours dirty water over him. B．The men laughed at him. C．A man laughs at him. D．A man is very rude to him. (3)Why does Pierre get even angrier? [　　] A．He meets some trouble in the restaurant. B．He eats something bad in the restaurant. C．He is wet and dirty all over. D．Some men laugh at him. (4)Someone says“look out”________ . [　　] A．when he sees Pierre in the restaurant B．after Pierre puts head out C．when he pours dirty water D．when Pierre is sitting by the window (5)What does the writer want to tell us in the story? [　　] A．It's important to pay attention to pronunciation. B．It's important to know some English idioms. C．It's important to be careful with English grammar. D．It's important to understand what each word means.