【正确答案】 C

【答案解析】[听力原文]1-5 Mr. Green:While you’re here, I wish you'd have a look around the house. I had a terrible fuel bill last winter. My mother-in-law was staying with us and she wanted the temperature around 80°F all the time. Engineer:Yes,lots of people overheat their houses. Actually 70 °F is comfortable, if you let yourself get used to it. Mr. Green: What’s the most popular heating system used nowadays? Engineer:The warm air system, the kind you have, has be-come more common because of economy and convenience. A heat chamber heats air, which passes through ducts and openings into the rooms by blowers or by convection. These openings are called outlets. Fitters are installed in the ducts to collect others. Fitters are installed in the ducts to collect dust. They can also control humidity to some extent. The fuel is usually coal, oil, or gas. Mr. Green:What kind of cooling systems are used in homes? Engineer:Either central or localized air conditioning is used. With the central system, air ducts bring cool air into the rooms. Sometimes, if the house has warm air heating, the same ducts may be used for air conditioning. This system provides an even temperature throughout the house. However, in homes which are not constructed for the central system, small individual air conditioners are installed at several windows. This is probably the easiest way. But the temperature of the rooms is quite uneven. Mr. Green:How important is the insulation of the house? Engineer: Very important, and sometimes this is not appreciated. The roof, for example, should have adequate insulation with glass fiber, aluminum toil, or something similar. It is important to have vapor seals on the warm side, to avoid moisture when the air cools. Double glazing of windows is also very important. [解题思路] 弄清格林先生去年燃料费用高的原因以及使用者的情况。 [详细解答] Mr.Green说"My mother-in-law was staying with us and she wanted the temperature around 80 f all the time．”“mother-in-law”为“the mother of one’s spouse”岳母。

【正确答案】 A

【答案解析】[解题思路] 弄清在冬天使人暖气舒服的温度。 [详细解答] 这篇conversation中的度数为华氏度-degree fahrenheit：of or according to a temperature scale that registers the freezing point of water as 32 F and the boiling point as 212 F at one atmosphere Of pressure．

【正确答案】 C

【答案解析】[解题思路] 弄清最普遍的取暖方式。 [详细解答] conversation中有“A heat chamber heats air，which passes throughs ducts and openings into the rooms by blowers or by convection．”“blowers”为“the de- vices to give release a blast of air or wind”鼓风机，“convection”为“heat transfer in a gasor liquid by the circulation of currents from one region to another转换。”

【正确答案】 C

【答案解析】[解题思路] 弄清小型个体空调的缺点。 [详细解答] conversation中有：However，in homes which are not constructed for the centra system，small individual air conditioners are installed at several windows．This is probably easiest way，but the temperature of the room is quite uneven．其中“uneven”为“not equal，as in size， length，or quality.”不均衡。

【正确答案】 D

【答案解析】[解题思路] 弄清在暖气下进行蒸气密封的作用。 [详细解答] “vapor”为“gaseous form into which certain liquid or solid substance can be converted by heating.”“seal”为“an air-tight closure．”密封。