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    Your smile is a sign of how you're feeling, and who you are. People with brighter smiles and white teeth

appear youthful, healthy, open to conversation and sure of themselves. A smile sends good messages about

yourself to others-it tells them you look good and feel good. A beautiful smile adds more to confidence than

almost anything else. Get back your confidence, feel younger and healthier, be friendlier and be easy to tallk

to. Smile brightly at the world and you'll look and feel great about yourself!

    There's a simple way that makes whitening your teeth fast and easy-that is really something to smile about!

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    We even offer a guarantee of paying 100% money back without asking any questions!Most of our

competitors won't give you your money back if you're dissatisfied with the results, but we certainly will.

    Don't let a lack of white teeth get you down. Even after years of caffeine (咖啡因), red wine, soft drinks

or smoking you can have amazing white teeth. That charming smile of your favorite star is no longer out of

your reach. It is possible to get a wonderful smile that makes you look and feel fantastic. We all know that a

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1. Why does the author talk about a person's smile in Paragraph 1? [ ]

A. To explain the relationship between smiling and health.

B. To tell us the importance of white teeth while smiling.

C. To prove that a person with a smile has more chances of becoming a star.

D. To advise us to keep positive by smiling.

2. According to the author, the method of whitening teeth mentioned in the passage is _____. [ ]

A. fast but expensive

B. easy but expensive

C. fast and easy

D. easy and cheap

3. If you aren't satisfied with the results after trying the teeth whitener, _____. [ ]

A. you won't get any money back

B. you will get back double what the product has cost you

C. you will get back all your money

D. you have to explain the reasons

4. What can be inferred from the passage? [ ]

A. Caffeine, red wine and soft drinks are usually bad for people's teeth

B. It takes at least a month to whiten your teeth.

C. People who appear healthy must often smile.

D. Most stars in the world often whiten their teeth.