题目

下列事例中，改变物体内能的方式上与其他三项不同的是（ ）A.热水倒入茶杯，茶杯的温度升高B.寒冷的冬天双手互搓，手的温度升高C.将冰冻食物放在水中解冻，水变凉D.刚煮熟的鸡蛋放在冷水中，鸡蛋的温度降低 答案：【答案】B【解析】A．热水倒入茶杯，茶杯的温度升高，是通过热传递改变了物体的内能；B．寒冷的冬天，双手互搓，手的温度升高，是手克服摩擦力做功，属于做功改变物体的内能；C．将冻食物在水中解冻，冻食物从水中吸收热量，水变凉，是通过热传递改变了物体的内能；D．刚煮熟的鸡蛋放在冷 阅读下列短文，然后从各题所给的四个选项（A、B、C和D）中，选出最佳选项。 　　Shanghai：Car rentals（出租）are becoming more and more popular as an inexpensive way of taking to the roads．Business people,foreigners and families alike are making good use of the growing industry． 　　The first car rental firm opened in Shanghai in 1992 and now 12 car rental players are in the game,with more than 11500 cars in their books． 　　The largest player— Shanghai Bashi Tourisn Car Rental Center offers a wide Variety of choices— deluxe sedans,minivans,station wagons,coaches．Santana sedans are the big favorite． 　　Firms can attract enough customers for 70 percent of their cars every month．This figure shoots up during holiday seasons like National Day,Labor Day and New Year's Day,with some recording 100 percent rental． 　　The major market force rests in the growing population of white-collar employees（白领雇员）,who can afford the new service,said Zhuang Yu,marketing manager of Shanghai Angel Car Rental Co． (1) The words “deluxe sedans”“minivans”and“station wagons”used in the text refer to ________ [　　] A． cars in the making B． car rental firms C． cars for rent D． car makers (2) Which of the following statements is true according to the text? [　　] A． 70% of the cars can be rented out on holiday． B． 70% of the customers are white-collar employees． C． More firms are open for service during holiday seasons． D． Some firms rent out all their cars during holiday seasons． (3) Shanghai's car rental industry is growing so fast mainly due to ________ [　　] A． better cars supplied by producers B． fast service offered by car rental firms C． the increasing number of white-collar employees D． people's growing interest in travelling during holidays