题目

如图，水平地面上的小车上固定有一硬质弯杆，质量均为m的小球A，B由细线相连，小球A固定在杆的水平段末端，当小车向右加速运动时细线与竖直方向的夹角为θ，下列说法正确的是（重力加速度为g）（ ） A . 小车的加速度大小等于gcotθ B . 细线对小球B的拉力大小等于mgsinθ C . 杆对小球A的作用力大小等于 D . 杆对小球A的作用力方向水平向右阅读理解。     Do you plan to go to Hong Kong Disneyland with your family this summer? If your dad smokes, you may have to ask him to be careful. From January 1st, Hong Kong banned (禁止) smoking in most public places.　　      These places include restaurants, workplaces, schools and so on. Even smoking in some outdoor places isnot allowed, for example, beaches, sports ground, museums and most areas of public parks.　　　     Hong Kong hopes the ban can stop passive smoking. What is passive smoking? When people smoke in a restaurant or on a bus, others have to smoke too. They don't want to smoke but they have no choice. Thisis passive smoking. It is bad for people's health.　　      And it'll be better if more people in Hong Kong　give up smoking because of the ban. Jack Lee, a 26-year-old student says, "The ban is really good. I don't like people smoking next to me. It's so smoky and smelly."　　      If someone breaks the ban, he will be fined HK$5,000.　　　     Hong Kong is not the first Asian city to have a smoking ban. On January 1, 2006,  Singapore banned smoking in most public places.　　 1. Smoking is not allowed _____ in Hong Kong.　　A. in indoor places B. in most public places C. at home 　　 2. Which outdoor place is not mentioned in the passage?　　A. The parkB. The beach C. The airport3. What's the purpose of the smoking ban in Hong Kong?　　 A. To stop passive smoking.　　 B. To stop the sale of cigarettes.　　 C. To stop people from smoking.　　 4. The example in Paragraph 4 shows (证明) that _____. A. Jack Lee likes smoking very muchB. people in Hong Kong support the ban　　 C. Jack Lee is used to smoking 　　 5. What's the Chinese meaning of the underlined word "fined"?　　A. 罚款 B. 给予C. 奖励