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Have you ever seen a dentist (牙医)before? Taking care of your teeth is necessary. And it’s important to have healthy teeth. They can help you speak clearly. Do you want to have healthy teeth?
Follow my suggestions.
It’s not enough to brush your teeth only once a day. Brush your teeth at once after each meal. Food debris (残渣) can make your teeth ill slowly. And you should brush all of your teeth, not just the front ones. Spend some time on the teeth along the sides. Take your time while you are brushing.
Spend at least three minutes each time when you brush.
Eat fewer candies or other sweet food. Lots of fruit and vegetables can make your teeth strong. Drink more water instead of drinks such as coffee and Coke.
Go to see a dentist and ask him to check your teeth once a year. He can find out your problem before it becomes too serious.
If you follow these suggestions, you’ll have white and healthy teeth.
1．From this passage, when do we need to brush teeth?| A．Before each meal. | B．After each meal. | C．Before sleeping. |
| A．At least one minute. | B．At least two minutes. | C．At least three minutes. |
| A．Fruit and sweet food. | B．Coffee and vegetables. | C．Fruit and vegetables. |
| A．Once a month. | B．Once a year. | C．Twice a year. |
| A．How to Have Healthy Teeth | B．How to See the Dentist | C．How to Have Healthy Food |
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
