I’m preparing the report for tomorrow’s meeting. Would you please the radio a little ? A.turn on B. turn off C. turn up D. turn down 题目和参考答案——青夏教育精英家教网—

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3. I’m preparing the report for tomorrow’s meeting. Would you please _____ the radio a little ?

A.turn on B. turn off C. turn up D. turn down

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相关题目

There was a time ______ I hated to go to school.

A. what B. which C. when D. that

32.So often ______ in recent years that it has almost become a rule.

A. has this happened B. this has happened

C. is this happening D. for this to happen

_____is the population of the city?

A．How much B．How many C．How D．What

Billy has recently _____ golf to provide himself with some relaxation.

A. taken on B. taken up C. taken over D. taken with

Film cameras and digital cameras work in a similar way.

Film cameras

After all, a film camera is basically a light – proof (不透光的) 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 (反向的)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.

67．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.

68．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

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

69．The main reason that sports photographers can get clear and big photos of players is that _ ___.

A．they use digital cameras B．the lens of their cameras is excellent

C．their focus lenses are short D．their focus lenses are long

70．Generally speaking, a digital camera’s price is ____.

A．closely related to the quality of the CCD

B．irrelevant to the quality of the CCD

C．closely related to the lens

D．irrelevant to the lens

32. 一William has asked me to lend him five pounds．Should I do him the favor and lend it to him?

—Certainly，otherwise he________to borrow it from me．

A.would try B．should have tried C．would have tried D．had tried

9．You_______if you had spoken the truth out. But you were as quiet as a mouse.

A．mustn’t have been blamed B．shouldn’t be blamed

C．wouldn’t have been blamed D．couldn’t be blamed

_______ full preparations, we decided to put off the party till next week.

A. We did not make B. Having not made C. We had not made D. Not having made

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