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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. But limit the choice of

[单项选择]Up goes gold, down goes the dollar. Most economists hate gold. Not, you understand, that they would turn up their noses at a bar or two. But they find the reverence in which many hold the metal almost irrational, That it was used as money for millennia is irrelevant: it isn’t any more. Modern money takes the form of paper or, more often, electronic data. To economists, gold is now just another commodity.
So why is its price soaring Over the pest week, this has topped $ 450 a troy ounce, up by 9% since the beginning of the year and 77% since April 2001. Ah, comes the reply, gold transactions are denominated in dollars, and the rise in the price simply reflects the dollar’s fall in terms of other currencies, especially the euro, against which it hit a new low this week. Expressed in euros, the gold price has moved much less. How- ever, there is no iron link, us it were, between the value of the dollar and the value of gold. A rising price of gold, like that of anything else, can
A. they look down upon
B. that can be exchanged in the market
C. worth people’s reverence
D. that should be replaced by other forms of money

[单项选择]Every year, college tuition goes up faster than inflation, and public figures respond with outrage. But the object of their anger is illusory: Tuition is no longer a meaningful number.
If colleges are (62) to bring down costs, we have to be honest about what the costs are. If families are to understand the financial implications of a college education, greater (63) is needed. And achieving these goals will require a (64) change in our vocabulary.
First, tuition rates are meaningless as an (65) of the actual cost of college education. At many private colleges with endowments (捐赠), the actual annual cost of educating a student is higher than the (66) indicated by the price tag.
This explains (67) tuition rises so much each year; colleges are trying to make up ground on costs that already significantly (68) tuition. But these increases narrow the gap very (69) Colleges generally make up the (70) fro