用高级程序设计语言编写的程序，要转换成等价的可执行程序，必须经过

A．汇编

B．编辑

C．解释

D．编译和连接

.  Your mouth will be opened and your teeth will be shown when you laugh. However, the h____(1)_____ those teeth are, the happier you look. Strong, healthy teeth can help you eat the right food to help you g_____(2)______. They also help you speak clearly. But do you know how to take care of your teeth? These should be f_______(3)______.

Brush your teeth twice a day after breakfast and before bedtime. If you can, brush after lunch or after eating sweet cakes. T____(4)_____ your time while brushing. Spend at least 3 minutes each time you brush. Brush all of your teeth, not just the f____(5)_____ ones. Spend some time on the teeth along the s_____(6)______ and in the back.  

Be sure the t____(7)_____ 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____(8)_____ between your teeth.

Brushing and flossing keep your teeth healthy. You also need to c______(9)______ about what you eat and drink. Eat lots of fruits and vegetables and drink water i____(10)____ of drinks.