Week Five 健康饮食
一、阅读理解（共16小题；共32。0分）
A
I am often laughed at for my habit of traveling by foot。 I often walk about 3 miles from home to work rather than take the subway。 Sometimes, kind-hearted drivers will offer me a ride， thinking that my car has broken down.
But for me， walking is a good opportunity to relax myself。 Besides, it helps my back recover from a day spent bent in front of a computer screen。 In terms of health， I have always thought I’d have the last laugh, and now there’s even more evidence on my side.
Nine years later， brain scans showed that those who had walked more had greater brain volume（容量) than those who walked less. Four years after that， the volunteers were tested again-this time for dementia(痴呆）。 Among the group, 116 people showed signs of
memory loss or dementia。 Those who had walked the most—at least 7 miles each week—were half as likely to have cognitive（认知） problems as those who walked the least.
A study has found that the simple act of walking may improve memory in old age。 As we age， our brains shrink， which can lead to the loss of memory。 However， experts say there’s still not enough data to prove that exercise can prevent memory loss。 It’s also too soon to say whether exercise may prevent dementia or simply delay it in people who would eventually develop it anyway。 But for those who suffer from dementia（痴呆）, even a short delay could mean great losses in quality of life.
1。 What is probably the best title for the passage？
A. Walking May Contribute to the Brain Activity
B。 Good Ways to Prevent Loss of Memory
C. Walking Is More Convenient Than Driving
D。 The Relationship Between Walking and Memory
2。 The underlined word ”shrink” in the last paragraph probably means healthylifestyle 。
A。 become smaller B。 become softer
C. become less clear D。 become tired
3。 According to the passage, we can infer that 。
A。 walking is one of the best ways to increase our memory
B. people’s memory won’t change much with proper exercise
C。 whether exercise can prevent dementia remains to be tested further
D。 those who exercise regularly are much easier to be successful
4. The passage is probably taken from a 。
A. news report B. fashion magazine
C。 science fiction D. health magazine
B
Modern science proves that a healthy lifestyle matters much to how long you can live and how well you live。 Here are some tips for you to form a healthy lifestyle。
Keep a scientific diet。 Keep in mind that sugar can be removed(去除） from our diet completely. Over intake(摄入量） of sugar is one of the main reasons for getting fat。 Over intake of protein（蛋白质) or fat and low intake of fiber can also lead to getting fat。 We only need a few grams of protein to keep our body in order。
Be always in a good mood。 There is a relationship between the mood and health。 A good mood keeps you in high spirits。 Thanks to the Internet， we can enjoy and learn much without going out。 Take a look at some online shops and pick up some bargains， enjoy music and movies and chat with good friends. Just keep happy.
Enough sleep。 Two studies show the reasons why teens and adults don't have enough sleep。 With teens， a major reason is mobile phone use； with adults, it's work。 Meanwhile， a third study of young children shows that lack of sleep in early life may lead to serious problems in future。 Everyone needs at least 8—hour sleep to recover(恢复） from tiredness and the hurt caused by hard work in the daytime。
Proper exercise. Do exercise to keep away from fatness. Because of the quick pace of the modem life， you don't have time to do exercise every day, but at least three times a week and 45 minutes each time。
5. What is the writer’s purpose in writing the passage？
A。 To tell the readers how to take proper exercise every day.
B. To provide some advice on how to form a healthy lifestyle.
C。 To ask people to care about their health rather than their work.
D。 To make some surveys among those who have health problems。
6. Which of the following can lead to getting fat according to the passage？
A. Low intake of protein。 B。 Low intake of fat.
C. Over intake of fiber。 D。 Over intake of sugar。
7. The main reason why teenagers don't have enough sleep is that they 。
A. use mobile phones too much B。 have too much homework
C。 eat too much sugar every day D。 don't have enough exercise
8. How many minutes do you need to do exercise at least every week？
A. 45 minutes. B。 90 minutes。 C. 115 minutes。 D。 135 minutes。
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