As many people hit middle age, they often start to notice that their memory and mental attention are not what they used to be. We suddenly can't remember where we put the keys just a moment ago, or an old friend's name, or the name of an old band we used to love. It happens to most of us, but is it unavoidable?
Scientists are increasingly showing that there's actually a lot that can be done. It turns that the brain needs exercise in much the same way as our muscles do, and the right mental workouts can improve our basic cognitive(认知) functions.
Now, a new San Francisco Web-based company has taken it a step further and developed the first "brain training program" designed to actually help people improve and regain their mental sharpness. Called Lumosity, it was designed by some of the leading experts from Stanford University. Lumosity is far more than an online place to exercise your mental skills. That's because they have combined these exercises with a Web-based program that allows you to systematically improve your memory and attention skills.
Apparently it works. One study showed students improved their scores on math tests by 34 percent after using Lumosity for six weeks, greater gains than those made by other students in the same class, who were not training with the Lumosity program. The company says its users have reported clearer and quicker thinking, improved memory for names, numbers, directions, increased alertness(警觉) and awareness, high mood, and better concentration at work or while driving.
What is the purpose of Lumosity?

A．To exercise the brain and muscles.

B．To combine exercises with a web-based program.

C．To improve basic cognitive functions.

D．To improve students’ scores on test.

Which of the following is true?

A．Memory losing is unavoidable.

B．Lumosity is unreasonable.

C．Muscles don’t need exercise.

D．Brains need exercise.

What does the last paragraph mainly tell us?

A．Lumosity is an effective program.

B．Users have improved their thinking.

C．A company made a Lumosity trial.

D．Lumosity was carried out in tests.

The author explains the training results by________

A．making a comparison.

B．presenting training findings.

C．analyzing facts.

D．setting down rules.