[单项选择]With regular exercise, the body builds up its levels of BDNF (brain-derived neurotrophic factor), and the brain’s nerve cells start to branch out, join together and communicate with each other in new ways. This is. the process that underlies learning: every change in the junctions between brain cells signifies a new fact or skill that’s been picked up and stowed away for future use. BDNF makes that process possible. Brains with more of it have a greater capacity for knowledge. On the other hand, says UCLA neuroscientist Fernando Gámez-Pinilla, a brain that’s low on BDNF shuts itself off to new information,
What will happen if a person has a brain that’s low on BDNF
A. He will be able to learn many new skills.
B. He will forget all the information stored in his brain.
C. He will be able to learn things quickly.
D. He will not pick up new information quickly.

[单项选择]Regular exercise can keep you energetic and contribute to a productive life in the long run.（　）
A. athletically
B. successively
C. ultimately
D. persistently

[填空题]

For most of us, body weight goes up with age—an average of one pound a year after 25, according to the American Medical Association. We can fight against body weight through exercise and the right dietary (饮食的) habits, according to the National Institute on Aging.
Consult your physician before beginning any diet or exercise program. Whichever activity you choose, start slowly—say ten minutes a day—and over the next six to eight weeks, build up to at least 30 minutes three to four times a week. "Grade your exercise between one and ten," suggests Dr. Richard Stein, "with one being not very tired and ten being exhausted. A comfortable exertion (费力) level between six and eight is what you should aim at."
In planning your diet, consider these tips: 1. Eat several small meals a day—as many as six. 2. Don’t skip breakfast. 3. Make the last meal of the day a small one. 4. A variety of foods is important for good health. Bu

[填空题]

For most of us, body weight goes up with age---an average of one pound a year after 25,according to the American Medical Association. We can fight against body weight through exercise and the right dietary (饮食的) habits, according to the National Institute on Aging.Consult your physician before beginning any diet or exercise program. Whichever activity you choose, start slowly --- say ten minutes a day--- and over the next six to eight weeks, build up to at least 30 minutes three to four times a week. “Grade your exercise between one and ten,” suggests Dr. Richard Stein, “with one being not very tired and ten being exhausted. A comfortable exertion (费力) level between six and eight is what you should aim at.”
In planning your diet, consider these tips:
1. Eat several small meals a day---as many as six. 2.Don’t skip breakfast.
3. Make the last meal of the day a small one.
4. A variety of foods is important for good health

[简答题]Following any virus attack, the human body builds up antibodies which confer immunity to that strain of virus, but a virus with the capacity to change its character is able to by-pass this protection.
______

[单项选择]

The human body has developed its millions of nerves to be highly aware of what goes on both inside and outside of it. This helps us adjust to the outside world. Without our nerves and our brain, which is a system of nerves, we couldn’t know what’s happening. But we pay for our sensitivity. We can feel pain when the slightest thing is wrong with any part of our body. The history of torture (折磨) is based on the human body being open to pain.
But there is a way to handle pain. Look at the Indian fakir (苦行僧) who sits on a bed of nails. Fakirs can put a needle fight through an arm, and feel no pain. This ability that some humans have developed to handle pain should give us ideas about how the mind can deal with pain.
The big thing in withstanding pain is our attitude toward it. If the dentist says, "This will hurt a little," it helps us to accept the pain. By staying relaxed, and by treating the pain as an interesting sensation (感觉), we can handle
A. Their relaxation.
B. Their interest.
C. Their nerves.
D. Their attitude.