Passage 1
A gadget which makes water out of air could become the great1t household invention since the microwave.
Using the same technology as a dehumidifier (除湿器), the Water Mill is able to create a ready supply of drinking water because it can always get it from an unlimited source — the air.
The company behind the machine says not only does it offer an alternative to bottled water in developed countries, but it is a solution for the millions who face a daily water shortage.
俄罗斯和叙利亚的关系The machine works by drawing in wet air through a filter (过滤器) and over a cooling instrument which changes it into water droplets. It can produce up to 12 liters a day. The Water Mill will also produce more water when storms pass over, as the amount of water which is contained in the air increases. In keeping with its eco-development, the machine u ses the same amount of electricity as three lights.
Inventor Jonathan Ritchey said: "The demand for water is off the chart. So people are looking for freedom from water distribution systems that are shaky and unreliable."
The machine, which is about 3 feet wide, is likely to cost £800 when it goes on sale here in the spring. Its makej*, Canadian Firm Element Four, roughly calculates that a liter of water cost around 20p to produce.
Environmentalists state that half the world's population will face water shortage because of climate change by 2080. One in five is said to lack access to safe drinking.
The Water Mill is not effective in areas where the amount of water contained in the air is below about 30 percent, but in Britain that won't be much of a problem.
1. What does the underlined word "it" refer do?
A. Drinking water. B. Invention. C. Microwave. D. Water Mill.
2. What do we learn about the machine?
A. It works in the same way as microwaves.
B. It is very expensive for families to afford.
C. It absorbs steam and turns it into water.
D. It helps to make the water clean to drink.
3. What does the passage lead us to believe?
A. The cost of water will go up. B. Bottled water will disappear sooner.
C. The machine is energy saving. D. The machine will be popular worldwide.
4. What's the best title for the passage?
甲基丙烯酸锌A. A New Way to Solve Water Problem B. A Machine to Make Water out of Air
C. A Dehumidifier to Produce Water D. An Absolutely New Invention
Passage 2
Film cameras and digital cameras work in a similar way.
Film cameras
李民庆After all, a film camera is basically a light-proof box. It has a lens (镜头) system to focus light onto the film at the back of the camera.
Let's suppose that we are outside on a beautiful summer day trying to take a picture of the family dog. We are using a film camera. We finally get the dog to lie still. You point the camera at him. What happens? Light goes into the camera lens and hits the shutter. In other words, nothing happens yet. Now let's say that the dog looks really cute and you decide to snap a picture. What happens? When you press the button, the shutter open for a very short period of time. A small amount of light passes through and hits the film at the back of the camera. This creates an upside-down and reversed image on the film.
When you finish the roll of the film, you can take it to the photo shop to develop it and you
will have a great picture of your dog!
Cameras come with different lens lengths. Why does it matter? Many small cameras have shorter focal lengths, which means that there is a small distance between the lens and the place where the light focuses at the back of the camera. This gives you a large view of the area you are taking a picture of. Lenses with a long focal length show a smaller area but allow you to focus on distant objects and make them bigger. They are often called telephoto lenses. A good example of a long focus lens is one that is used by sports photographers to get photos of football players as if they were standing right beside them.
Digital cameras
In digital cameras, the light falls not on film but onto a sensor (传感器) called a CCD (Charge Coupled Device). This digitally converts (转变) light and colour into a digital information or pixels (象素). The CCD is the heart of any digital camera and usually the most expensive part —depending on how good it is.仔羊计划
印库网1. Which of the following statements is TRUE?
A. Both digital and film cameras focus light onto the film.
B. All cameras have a sensor.
C. Digital cameras and film cameras have something in common..
D. Small cameras usually have longer focal lengths.
2. In the "Film cameras" part, you fail to take the picture of the dog because .
A. light goes into the camera lens and hits the shutter
新技术
B. you haven't aimed the camera at the dog
C. the image of the dog is not created
D. the sensor fails to convert light and colour into a digital information
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