图为“海洋表面等温线和洋流分布示意图”，其中表示北半球副热带大陆东岸的是（    ）

如图所示的几何体为圆台，其俯视图正确的是（　　）

一辆三轮车，前轮直径为3dm，后轮直径为2dm，前轮转50周所行的路程，后轮要转多少周？

下列关于机械运动的说法正确的是（　　）

B

    John is an American boy. His family is in China now. John likes chocolates (巧克力) very much. But his mother doesn't give him any. They are not good for him, she thinks. But John has a very nice grandfather. The old man loves him very much, and sometimes he buys John some chocolates. Then his mother lets John eat them. She wants to make the old man happy. One Sunday evening John says in his room, "Please, God. Make them give me a big box of chocolates tomorrow. It's my birthday." His mother says, "God can't hear you, my boy." "I know, but my grandfather is in the next room. He can hear."