题目内容：

If you are a traditional traveller who believes cameras are irreplaceable，here are some things you should pay attention to when looking for the perfect camera.

Sensor size

Along with the megapixel (百万像素) count，the size of the sensor dictates the general image quality as well as the camera's performance in low light. It also determines whether the camera can electronically put the details it captures bigger enough to see—which is what makes the pictures not clear enough to see when you view the photos on a bigger screen.

Portability

“The important thing is that the camera isn't too big or heavy，and that you have a good zoom (变焦距镜头) range for both wide－angle and telephoto shots (远距摄影照片)，”Atherton told CNN.A good choice would be a slim，light pocket camera with a high－qualified built－in optical zoom. “These are very popular for travel as they are light，but built with a telephoto lens that can zoom up to 60 times，” Atherton said.

Zoom and shutter (快门) speed

For action or crowd shots，a fast shutter speed is a key factor. “When dealing with anything that's active—wildlife or people in action on the street—faces change within a tiny part of a second，” said Arnold，“a fast shutter speed is helpful in shooting the several hundred photos you might need to get that single winning shot.”

1. According to Atherton，what isn't a requirement for an ideal camera?

A．Portable shape.  

B．Wide－ranged zoom.

C．Good telephoto lens. 

D．Reasonable sensor size.

2.What will contribute to a satisfactory photo of a running lion in the wild?

A．The sensor size.          B．The zoom range.

C．The shutter speed.        D．The megapixel.

3.Which of the following can be the best title of the passage?

A．How to choose ideal travel cameras?

B．How to put a camera into good use?

C．A fashionable camera—up for sale

D．A high－quality camera—a modern life's must