题目

下列关于城市聚落与乡村聚落差异的表述，错误的是( ) A . 人口性别构成的差异 B . 人口生活方式的差异 C . 人口职业构成的差异 D . 人口密度的差异 答案：A     Teeth are important. Strong, healthy teeth help you chew foods that help you grow. They help you speak clearly. And, they help you look your best. Here is some advice for you to take care of your teeth.     1. Brush your teeth the right way.     Brush your teeth at least twice a day—after breakfast and before bedtime. If you can, brush after lunch, too.     Brush all of your teeth, not just the front ones. Spend time brushing teeth along the sides, and back of your mouth. Brush away from you gums (牙龈), too.     Spend at least three minutes each time you brush. Play a song you like to help pass the time. Get a new toothbrush every 3 months. When you buy your toothbrush, be sure it is a good one.     2. Learn how floss(用牙线清洁) your teeth.     Flossing is a very important way to keep your teeth healthy. Food may hide in places where a toothbrush cannot get to, like the space between two teeth. Flossing can help get it out. Carefully move the floss between two teeth, up and down. You’ll need to floss you teeth at least once a day.     3. Have good eating habits.     You need to be careful about what you eat and drink. Eating sugar is a main reason of making things even worse. Eat lots of fruit and vegetables and drink water instead of other kinds of drinks. 1. You need at least         minutes when you brush your teeth.   A. one               B. two                   C. three                 D. four 2. If we want to have good teeth, we should        .   A. eat more cakes      B. eat more meat    C. eat more sugar   D. have good eating habits 3. What is the best topic of this passage?   A. How to Take Care of Your teeth          B. How to Brush Your Teeth   C. How to Floss Your Teeth                    D. How to Form Good Eating Habits 4. Which of the following is NOT true according to this passage?   A. We should brush our teeth at least twice a day.   B. Flossing can help to get out the food hidden between two teeth.   C. Eating sugar is one of the main reasons to make teeth bad.   D. We don’t have to brush our teeth if we eat a lot of fruit and vegetables.