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题型:填空题 题类:常考题 难易度:困难

    Your mouth will be opened and your teeth will be shown when you laugh. However, the h those teeth are, the happier you look. Strong, healthy teeth can help you eat the right food to help you g . They also help you speak clearly. But do you know how to take care of your teeth? These should be f .
    Brush your teeth twice a day after breakfast and before bedtime. If you can, brush after lunch or after eating sweet cakes. T  your time while brushing. Spend at least 3 minutes each time you brush. Brush all of your teeth, not just the f ones. Spend some time on the teeth along the s  and in the back.  
B    e sure the t  you use is soft and should be changed every three months or even less.
Learn how to floss(用牙线清理) your teeth, which is a very important way to keep them healthy. It feels s when you do it at first, but soon you'll get used to doing it. The floss cleans up food that's h  between your teeth.
    Brushing and flossing keep your teeth healthy. You also need to c  about what you eat and drink. Eat lots of fruits and vegetables and drink water i  of drinks.

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succeed,they,work,careful,make,so,happy,close,one,few,either,but

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Scientists have found that monkeys like to use one of their hands more than the other—but it can be either hand. There are as many right-handed monkeys as the left -handed {#blank#}6{#/blank#} . Next time you visit the zoo and do watch the monkeys {#blank#}7{#/blank#} . You'll see that some of them will use their right hands and others will use their left hands. But men use their right hands better and this {#blank#}8{#/blank#} life difficult for the left-handed ones. We live in a right-handed world. Some scientists have found out that more of {#blank#}9{#/blank#} people are left-handed, but they don't know why. But they are {#blank#}10{#/blank#} hard to discover the secret.

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