【正文】 oice in the bank is identified by a letter. Please mark the corresponding letter for each item on Answer Sheet 2 with a single line through the centre. You may not use any of the words in the bank more than once. Questions 47 to 56 are based on the following passage. Walking, if you do it vigorously enough, is the overall best exercise for regular physical activity. It requires no equipment, everyone knows how to do it and it carries the 47 risk of injury. The human body is designed to walk. You can walk in parks or along a river or in your neighborhood. To get 48 benefit from walking, aim for 45 minutes a day, an average of five days a week. Strength training is another important 49 of physical activity. Its purpose is to build and 50 bone and muscle mass, both of which shrink with age. In general, you will want to do strength training two or three days a week, 51 recovery days between sessions. Finally, flexibility and balance training are 52 important as the body ages. Aches and pains are high on the list of plaints in old age. The result of constant muscle tension and stiffness of joints, many of them are 53 , and simple flexibility training can 54 these by making muscles stronger and keeping joints lubricated (潤滑 ). Some of this you do whenever you stretch. If you watch dogs and cats, you’ll get an idea of how natural it is. The general 55 is simple: whenever the body has been in one position for a while, it is good to 56 stretch it in an opposite position. A) allowing F) helping K) prevent B) avoidable G) increasingly L) principleC) briefly H) lowest M) provokeD) ponent I) maintain N) seriously E) determined J) maximum O) topicSection B Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should decide on the best choice and mark the corresponding letter on Answer Sheet 2 with a single line through the centre. Passage One Questions 57 to 61 are based on the following passage. Junk food is everywhere. We’re eating way too much of it. Most of us know what we’re doing and yet we do it anyway. So here’s a suggestion offered by two researchers at the Rand Corporation: Why not take a lesson from alcohol control policies and apply them to where food is sold and how it’s displayed? “Many policy measures to control obesity（肥胖癥）assume that people consciously and rationally choose what and how much they eat and therefore focus on providing information and more access to healthier foods,” note the two researchers. “In contrast,” the researchers continue, “many regulations that don’t assume people make rational choices have been successfully applied to control alcohol, a substance — like food — of which immoderate consumption leads to serious health problems.” The research references studies of people’s behavior with food and alcohol and results of alcohol restrictions, and then lists five regulations that the researchers think might be promising if applied to junk foods. Among them: Density restrictions: licenses to sell alcohol aren’t handed out unplanned to all ers but are allotted（分配）based on the number of places in an area that already sell alcohol. These make alcohol less easy to get and reduce the number of psychological cues to drink. Similarly, the researchers say, being presented with junk food stimulates our desire to eat it. So why not limit the density of food outlets, particularly ones that sell food rich in empty calories? And why not limit sale of food in places that aren’t primarily food stores? Display and sales restrictions: California has a rule prohibiting alcohol displays near the cash registers in gas stations, and in most places you can’t buy alcohol at drivethrough facilities. At supermarkets, food panies pay to have their wares in places where they’re easily seen. One could remove junk food to the back of the store and ban them from the shelves at checkout lines. The other measures include restricting portion sizes, taxing and prohibiting special price deals for junk foods, and placing warning