# Solar water purifier(SW40)

- 科目：雅思听力真题（Part 4）
- 考频：中频
- 最近考试：2017.9.21/2016.1.9/2011.2.19
- 题目数：10
- 来源页：https://www.yaquan.site/paper/f4bbc445-bc08-4f65-9dfd-dac9dfdddb87（在线机考练习与音频请访问该页面）
- 数据更新：2026-10-29

## 题目原文

00:00:00,140 
 You will hear a lecturer giving a talk to design and technology students about a new device which uses the sun to purify water. First, you have some time to look at questions thirty-one to forty. Now listen carefully and answer questions thirty-one to forty. 
 00:00:20,420 
 For many parts of the world today, a lack of clean drinking water is a major problem. In some developing areas, bore water, which is water that comes out of the ground, is the only water available. 
 00:00:35,080 
 Unfortunately, bore water may be dangerous to drink because it contains excessive amounts of salts. In recent months, I've been working with a research team to develop a device that will help solve this problem. 
 00:00:49,560 
 What we came up with is a solar water purifier, which we have called the SW-40. 
 00:00:56,840 
 And this device not only makes bore water drinkable, it can even process seawater. In fact, it even passed the rigorous testing standards applied by hospitals to determine whether water is sterile enough for use there. 
 00:01:13,440 
 The only problem we do face at the moment is with its manufacturing. The present method involves a process called vacuum forming, which tends to be rather slow. 
 00:01:25,580 
 We'd like to change to an injection motive process, which is much faster but would cost quite a lot to switch to, around one million Australian dollars. There are a number of private companies that are very keen to go into partnership with us over this, but my preferred option would be a global aid agency known as Health International that sponsors projects like ours. 
 00:01:53,360 
 It has a long history of working in these areas, and although it may take a little longer to get an agreement, it should mean a better deal all around. So just how useful is this device of ours? Well, the amount of pure water it is capable of producing each day varies as the amount of sunlight available varies. However, on a hot day when the temperature is around about twenty-five to thirty degrees Celsius with the sun shining clearly through a blue sky, it produces anywhere from seven liters per day to as much as nine liters. Now, most people can survive on one to two liters per day. 
 00:02:37,880 
 So even under difficult conditions, one family could live off one of these devices. So a normal size village would require several of these to supply all its needs. Okay, so let's look at the device in more detail. It weighs eight kilograms and is the size of a medium-sized suitcase. The SW-40 has no filters, no electronics, no moving parts, and uses no chemicals. So how does it work? Well, there's a rectangular box with a glass lid on it, and on the edge of the box is a steel frame to hold everything together. 
 00:03:20,200 
 And inside the box is a piece of black plastic, which is divided up into pockets. You need an incline, so the water flows through the device. The optimum is twelve point five degrees to the horizontal, although it can be one or two degrees above or below that. 
 00:03:39,780 
 Impure water is piped in at the top of the box and flows down through the little pockets until they're all full. 
 00:03:48,240You then let Mother Nature in the form of the sun, do its work as it shines through the glass window. It produces infrared light which heats the water. At the same time, ultraviolet light from the sun, or UV as we more commonly call it, is also radiated. If there are germs present in the water, prolonged exposure to this type of light will kill them. 
 00:04:14,520 
 Then, as the temperature of the water rises due to the sun's heat, the water vaporizes and condenses on the underside of the glass panel. The droplets of water slowly run down the glass to a collection tank ready to be taken away for drinking or whatever. So that's basically how it works. Now, what this means- 
 00:04:38,400 
 That is the end of section four. You now have half a minute to check your answers.

## 题目与答案

### 31. High levels of 31_____ make bore water unsafe to drink.

High levels of 31_____ make bore water unsafe to drink.

**答案**：salts

原文定位：Unfortunately, bore water may be dangerous to drink because it contains excessive amounts of salts

同义替换：「high levels」↔「excessive amounts」；「unsafe」↔「dangerous」

### 32. The SW40 produces water that is so pure it can be used in 32_____ .

The SW40 produces water that is so pure it can be used in 32_____ .

**答案**：hospitals

原文定位：In fact, it even passed the rigorous testing standards applied by hospitals to determine whether water is sterile enough for use there

同义替换：「so pure」↔「sterile enough」

### 33. One problem with the present method of production of the SW40 is that it is quite 33_____ .

One problem with the present method of production of the SW40 is that it is quite 33_____ .

**答案**：slow

原文定位：The present method involves a process called vacuum forming, which tends to be rather slow

同义替换：「quite」↔「rather」

### 34. The speaker hopes to acquire financial support from an agency called 34_____ .

The speaker hopes to acquire financial support from an agency called 34_____ .

**答案**：Health International

原文定位：my preferred option would be a global aid agency known as Health International that sponsors projects like ours

同义替换：「financial support」↔「sponsors」

### 35. The SW40 has a maximum output of 35_____ on a sunny day.

The SW40 has a maximum output of 35_____ on a sunny day.

**答案**：9|9 liters

原文定位：on a hot day;it produces anywhere from seven liters per day to as much as nine liters

同义替换：「maximum output」↔「as much as」

### 36. Each SW40 produces enough water for a 36_____ .

Each SW40 produces enough water for a 36_____ .

**答案**：family

原文定位：even under difficult conditions, one family could live off one of these devices

同义替换：「produces enough water for」↔「could live off」

### 37. Cross-section of SW40 Solar Water Purifier Infra-red light heats water lid made of 37_____

Cross-section of SW40 Solar Water Purifier Infra-red light heats water lid made of 37_____

**答案**：glass

原文定位：The SW-40 has;a rectangular box with a glass lid on it

### 38. best inclined at angle 38_____

best inclined at angle 38_____

**答案**：12.5

原文定位：The optimum is twelve point five degrees to the horizontal

同义替换：「best」↔「optimum」

### 39. UV light destroys 39_____ .

UV light destroys 39_____ .

**答案**：germs

原文定位：If there are germs present in the water, prolonged exposure to this type of light will kill them

同义替换：「destroys」↔「kill」

### 40. water 40_____ containing pure water

water 40_____ containing pure water

**答案**：collection tank

原文定位：The droplets of water slowly run down the glass to a collection tank ready to be taken away for drinking

同义替换：「containing pure water」↔「ready to be taken away for drinking」

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