题干

一辆重为1.5×104N的小汽车,当它以60Km/h的速度在水平路面上匀速行驶时受到的牵引力为2000N,那么汽车受到的阻力为____N;当它停在水平路面上时,它受到的支持力为____N.

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2000,1.5×104

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    Weight loss is a hard topic. Lots of people aren't satisfied with their present weight, but most people aren't sure how to change it. You may want to look like the models or actors in magazines or on TV, but those goals might not be healthy or realistic for you.____

    So what should you do about your weight control?

    ____The best way to find out if you are at a healthy weight or if you need to lose or gain weight is to talk to a doctor or dietitian(营养学家)____ If it turns out that you can benefit from weight loss then you can follow a few of the simple suggestions listed below to get started.

    ____People who lose weight quickly by crash(速成的)dieting or other extreme measures usually gain back all of the pounds they lost, because they haven't permanently changed their habits. Therefore, the best weight management ways are those that you can maintain for a lifetime.

    Small changes are a lot easier to stick with than large ones. Try reducing the size of what you eat.____ Once you have that down, start gradually introducing healthier foods and exercise into your life.

    It's a good idea to maintain a healthy weight because it's just that: healthy.

A. Try giving up regular soda for a week

B. Try to pay attention as you eat and stop when you're full.

C. Weight management is about long-term success.

D. Besides, no magical diet will make you look like someone else.

E. Being healthy is really about being at a weight that is right for you.

F. Changing from whole to nonfat or low-fat milk is also a good idea.

G. They will compare your weight with healthy standards and help you set goals.