题目

某实验员为了探究“向水中释放潜水装置的有关规律”，他建立了如图甲所示的理想模型。由复合材料制成的圆柱体A悬挂在动滑轮下面，一根绳子通过某种绕法（未画出）将定滑轮、动滑轮组成滑轮组，绳子的一端握在实验员手中。实验员通过缓慢释放绳子，使物4体A在空中下降，然逐渐进入水中。实验时，物体A下表面向下移动的距离为x，实验员手拉绳子的力F与x的关系如图乙所示，已知圆柱体A的密度ρA＝2×103kg/m3，底面积S＝0.09m2，高H＝1m；不计动 Traveling can be expensive. But there are some ways to save money when traveling. Try some of the advice below on your next vacation and your wallet will thank you.Look for city tourism cards. With the card, you can pay less at restaurants and shops. You don't have to wait for a long time at busy attractions. You might even get free tickets to top tourist attractions. City tourism cards can save your money and time without question.Don't get the best room. How long will you stay in your room? Will you just be sleeping there? Do you really need a bigger room with a good view (景色)?Find a hotel outside a city. It can help you save some money by choosing a hotel away from big tourist attractions, for you are always doing the same—go to the attractions and then return to your hotel to sleep.Book (预订) a room with a kitchen. Although some people might not like to cook while on vacation, I don't mind making breakfast in my room. We always eat at a nice restaurant on our last night of the vacation. I'd rather eat breakfast and lunch at the hotel and then spend much money on a delicious supper.【1】With ________, you can pay less at restaurants and shops.A.ID cardsB.tourism cardsC.bank cardsD.phone cards【2】To save some money, the writer advises tourists to ______.A.get the best roomB.live near big tourist attractionsC.live away from big tourist attractionsD.take a map with them when traveling【3】The writer prefers to make breakfast and lunch in the hotel because ______.A.they are healthier and more deliciousB.he likes cookers in the hotelC.there are not any restaurants in the neighborhoodD.he'd rather spend much money on a delicious supper【4】What does the passage mainly talk about?A.How to save money when traveling.B.How to get a tourism card.C.How to find a hotel outside a city.D.How to book a room on the Internet.