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 ____.

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