【正文】 out of the room. A short while ago, my sister helped me to carry one of my old bookcases up the stairs. She went into my room and got a big surprise when she saw all those books on the floor. 39。Lesson53 Hot snake 觸電的蛇Lesson55 Not a gold mine 并非金礦cursed tree39。 she asked impatiently. 39。冬季冷水水溫低，太陽(yáng)能熱水器產(chǎn)水量約為夏季三分之一。這樣確保整個(gè)系統(tǒng)在最嚴(yán)寒的冬季夜晚（即使零下十幾度）也不會(huì)結(jié)冰，白天一到，只要有陽(yáng)光，太陽(yáng)能熱水器就能正常使用；③在冬季較長(zhǎng)時(shí)間沒(méi)有陽(yáng)光時(shí)且持續(xù)低溫時(shí)，采用排水法防凍既把水全部排掉，到陽(yáng)光好時(shí)上水，但是上水必須在早晨或夜間以免產(chǎn)生的真空管爆管現(xiàn)象。目前由于許多單位擔(dān)心太陽(yáng)能中央熱水系統(tǒng)不穩(wěn)定，影響了太陽(yáng)能中央熱水系統(tǒng)大規(guī)模的使用，其實(shí)不然，由于太陽(yáng)能中央熱水系統(tǒng)擁有獨(dú)立的輔助加熱設(shè)備，并且有儲(chǔ)熱水箱停水或停電時(shí)都能供應(yīng)一部分或全部的熱水，所以比單純的電加熱設(shè)備或燃油鍋爐或燃?xì)忮仩t穩(wěn)定得多，當(dāng)然我們也可以把原單位有電加熱設(shè)備或燃油鍋爐或燃?xì)忮仩t改造一下，作為太陽(yáng)能中央熱水系統(tǒng)的輔助加熱設(shè)備節(jié)省一部分投資。五、太陽(yáng)能中央。電加熱設(shè)備或燃油鍋爐或燃?xì)忮仩t作為太陽(yáng)能中央熱水系統(tǒng)時(shí)，輔助加熱設(shè)備由自動(dòng)控制器控制，自動(dòng)控制器由時(shí)間控制器、溫度控制器等組成。另外還須采取適當(dāng)措施防止循環(huán)管道，熱水管及冷水管在冬季結(jié)冰影響整個(gè)系統(tǒng)正常使用，常用的防凍措施有以下幾種：①下循環(huán)管及冷水管道上安裝電熱帶，控制方式為：當(dāng)管道內(nèi)的水溫低于設(shè)定的下限溫度時(shí)如1℃，電熱帶通電加熱，當(dāng)管道內(nèi)的水溫達(dá)到設(shè)定的上限溫度時(shí)8℃時(shí)，電熱帶斷電，停止加熱?？芍刻烀科椒教?yáng)能集熱量為120（60－16）= 5280千卡,㎡In future, astronauts will be required to descend from a spaceship while it is still in space and to return to it. The ability to do this will be necessary in future flights to distant planets. Scientists are now trying to discover if this is possible. The spaceship Astra which left the earth a short time ago, will be travelling three hundred miles into space. At a certain point, the Astra will stop for a short time and an astronaut will attempt to leave the stationary spaceship and then return to it. We shall not know whether the experiment has been successful until we have received a radio message. The first message is expected to arrive at 7 o39。 As soon as I went outside, I forgot all about Madam Bellinsky because my wife hurried towards me. 39。Our dog, Rex, used to sit outside our front gate and bark. Every time he wanted to e into the garden he would bark until someone opened the gate. As the neighbours plained of the noise, my husband spent weeks training him to press his paw on the latch to let himself in. Rex soon became an expert at opening the gate. However, when I was going out shopping last week, I noticed him in the garden near the gate. This time he was barking so that someone would let him out ! Since then, he has developed another bad habit. As soon as he opens the gate from the outside, he es into the garden and waits until the gate shuts. Then he sits and barks until someone lets him out. After this he immediately lets himself in and begins barking again. Yesterday my husband removed the gate and Rex got so annoyed we have not seen him since. Lesson58 A blessing in disguise? 是因禍得福嗎？ said the conductor. 39。 39。 the conductor said. 39。 I39。t like losing my way. I went on an excursion recently, but my trip took me longer than I expected. Lesson47 A thirsty ghost 嗜酒的鬼魂A thief, yes, 39。 mending,39。 she asked impatiently. 39。cursed tree39。Lesson55 Not a gold mine 并非金礦Lesson53 Hot snake 觸電的蛇We have just moved into a new house and I have been working hard all morning. I have been trying to get my new room in order. This has not been easy because I own over a thousand books. To make matters worse, the room is rather small, so I have temporarily put my books on the floor. At the moment, they cover every inch of floor space and I actually have to walk on them to get in or out of the room. A short while ago, my sister helped me to carry one of my old bookcases up the stairs. She went into my room and got a big surprise when she saw all those books on the floor. 39。 I answered.t matter,39。 39。 answered the conductor. I39。Tired of sleeping on the floor, a young man in Teheran saved up for years to buy a real bed. For the first time in his life, he became the proud owner of a bed which had springs and a mattress. Because the weather was very hot, he carried the bed on to the roof of his house. He slept very well for the first two nights, but on the third night, a storm blew up. A gust of wind swept the bed off the roof and sent it crashing into the courtyard below. The young man did not wake up until the bed had struck the ground. Although the bed was smashed to pieces, the man was miraculously unhurt. When he woke up, he was still on the mattress. Glancing at the bits of wood and metal that lay around him, the man sadly picked up the mattress and carried it into his house. After helesson46 Expensive and unfortable 既昂貴又受罪 Two months later, some more money was sent to Sam with another note:39。but they did not steal anything.39。 said Mrs Sterling later, 39。but only 5o per cent a thief!39。A public house which was recently bought by Mr Ian Thompson is up for sale. Mr Thompson is going to sell it because it is haunted. He told me that he could not go to sleep one night because he heard a strange noise ing from the bar. The next morning, he found that the doors had been blocked by chairs and the furniture had been moved. Though Mr Thompson had turned the lights off before he went to bed, they were on in the morning. He also said that he had found five empty whisky bottles which the ghost must have drunk the night before. When I suggested that some villagers must have e in for a free drink, Mr Thompson shook his head. The villagers have told him that they will not accept the inn even if he gives it away. Lesson49 The end of a dream 美夢(mèng)告終39。ll tell you where to get off,39。This is as far as we go.39。It doesn39。Well, in that case, I prefer to stay on the bus,39。Lesson52 A pretty carpet 漂亮的地毯The tiny village of Frinley is said to possess a 39。Where have you been hiding ?39。clock this evening. By that time, the Astra will have been flying through space for seventeen hours and will have circled the earth a great many times. When the first radio messages have been received, the results of the trip will be announced immediately.The strap needsThe whole village soon learnt that a large sum of money had been lost. Sam Benton, the local butcher, had lost his wallet while taking his savings to the postoffice. Sam was sure that the wallet must have been found by one of the villagers, but it was not returned to him. Three months passed, and then one morning, Sam fou