Is there a way to quickly recall information just before taking an exam? Walking backward may be a good way to solve the problem. Scientists from the University of Roehampton in the UK said this activity can help people improve their short-term memory.

Researchers asked 114 volunteers to watch a video. After watching the video, volunteers were divided into three groups. One group was told to walk 10 meters forward. The second group walked 10 meters backward. The third group stood in one place. All three groups were then asked 20 questions about what they saw in the video.

The scientists found that the backward-walking group got two more answers correct than the other two groups.

This suggests that the connection between time and space is important for how our brains form memory. "Time is really expressed by space, " Study leader Aleksandar Aksentijevic told the Daily Mail. When you walk backward, you see things from a different point compared to walking forward. This difference helps people recall things that happened in the past.

And walking backward is not just good for our brains. It is also good for the other parts of our body. Compared to walking forward, walking backward is more challenging. This can help us improve our health. Walking backward uses more energy in a short time and burns more calories (卡路里）.

Walking backward also puts less stress on our knees. It could be helpful for people who often have pain in their knees.

This might be why many old people like walking backward.

【小题1】How many people were in each group when the volunteers were divided into groups?

A．10.

B．20.

C．38.

D．57.

【小题2】What's the writer's opinion of walking backward?

A．Walking backward can help you deal with nervousness before an exam.

B．Walking backward is good for old people's knees.

C．Walking backward uses less energy in a short time.

D．Walking backward can help people predict the future.

【小题3】Which of the following is TRUE according to the passage?

A．The three groups got about the same number of questions right.

B．Walking backward can look at things from the the same point.

C．Walking forward is more challenging than walking backward.

D．Practicing walking backward can improve your short-term memory.

【小题4】What's the main idea of the passage?

A．Some ways to quickly recall information.

B．Walking backward is good for people.

C．The difference between walking backward and forward.

D．Time and space are important for forming memories in the brain.