单选题 As many people hit middle age, they often start to notice that their memory and mental clarity are not what they used to be. We suddenly can't remember where we put the keys just a moment ago or an old acquaintance's name. As the brain fades, we refer to these occurrences as "senior moments." While seemingly innocent, this loss of mental focus can potentially have a detrimental impact on our professional, social, and personal well-being.
Neuroscientists are increasingly showing that there's actually a lot that can be done. It turns out that the brain needs exercise in much the same way our muscles do, and the right mental workouts can significantly improve our basic cognitive functions. Thinking is essentially a process of making neural connections in the brain. Because these connections are made through effort and practice, scientists believe that intelligence can expand and fluctuate according to mental effort.
A new company has taken it a step further and developed the first "brain training program," called Lumosity, to actually help people improve and regain their mental sharpness. Lumosity is far more than an online place to exercise your mental skills. That's because they have integrated these exercises into a Web-based program that allows you to systematically improve your memory and attention skills. The program keeps track of your progress and provides detailed feedback on your performance and improvement. Most importantly, it constantly modifies and enhances the games you play to build on the strengths you are developing—much like an effective exercise routine requires you to increase resistance and vary your muscle use.
Apparently it works. In randomized, controlled clinical trials Lumosity was shown to significantly improve basic cognitive functions. One study showed students improved their scores on math tests by 34 percent after using Lumosity for six weeks. The company says its users have reported clearer and quicker thinking, improved memory, increased alertness and awareness, elevated mood, and better concentration at work or while driving.
While many of the games at Lumosity are free, a modest subscription fee is required to use the full program over the long term. However, Lumosity is currently offering a free trial of their program to new users so that you can see how well it works before you decide to subscribe. The company believes the results will speak for themselves.

单选题 What can we learn about "senior moments"?
A. They are nothing to be worried about.
B. They happen to each middle-aged person.
C. They mostly happen to the elders.
D. They are signs of declining memory.

单选题 Neuroscientists are beginning to find that ______.
A. cognitive functions can be improved by mental effort
B. intelligence varies with the amount of physical exercise
C. "senior moments" are quite useful at work
D. our brain and muscles should be trained differently

单选题 From Paragraph 3, it can be concluded that Lumosity ______.
A. is just an online place to exercise your mental skills
B. requires the users to keep doing the same games
C. is a set of exercises intended for the mentally-retarded
D. can help users make improvement in the brain

单选题 Clinical trials have proved that Lumosity ______.
A. is better than reported
B. is highly effective and beneficial
C. should be under strict control
D. leaves much to be desired

单选题 Which of the following statements is true about Lumosity?
A. Access to these games is quite expensive.
B. Chronic users have to pay for the access to the games.
C. All the games at Lumosity are free of charge.
D. Access to the games is limited to subscribers.

单选题 The main purpose in writing this passage is to ______.
A. present the new findings of neuroscientists
B. remind the middle-aged to take physical exercise
C. describe how Lumosity came into being
D. introduce how braining training makes you smarter