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Everyone wants to have healthy teeth. Here are some ways to help you keep your teeth healthy:
1. Brush your teeth at least twice a day. Spend three minutes brushing your teeth each time.
2. Brush your teeth well at the right time, after you wake up and before you go to bed.
3. Brush all teeth, not just the front teeth. Spend some time on the sides and back of your teeth.
4. Use a soft toothbrush that won’t hurt your teeth.
5. It’s important to check your teeth.
6. Replace your toothbrush every three months.
7. If you can’t brush your teeth, rinse (漱) your mouth with water.
These are some methods that you can easily use and they are very helpful in maintaining a healthy smile and teeth. Another important thing is to eat healthy foods such as fruits and vegetables, milk, eggs and meat.
1．When is the best time to brush your teeth? ( )| A．Before breakfast and before dinner. |
| B．Before breakfast and after dinner. |
| C．After breakfast and before dinner. |
| A．Every three months. | B．Every two months. | C．Every five months. |
| A．Brush your teeth for three minutes each time. |
| B．Rinse your mouth if you have no time to brush your teeth. |
| C．Just brush the front teeth. |
| A．To introduce how to protect the teeth. |
| B．To tell us how to buy the toothbrush. |
| C．To show the best time to protect the teeth. |
| A．A teacher. | B．A dentist. | C．A doctor. |
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
