若（ $\frac{4}{a^2-4}$ + $\frac{1}{2-a}$ ）•w=1，则w=（   ）

完形填空
    If you often have a cold, headache or backache, there is something wrong with your health. Eating healthy food 1good for our health.
    Tofu（豆腐）, milk, vegetables are healthy for us. Tofu is a kind of traditional（传统的）2food. We often 3 it in China. Now more and more people 4 other countries think tofu is good for health, 5. They also like eating it. Milk is 6  kind of health food. Every day you should  7  one or two glasses of milk.
    It can 8 us strong.
    Vegetables are very important. You should 9 them. There are vitamin(维他命) A, B, C, D , E and so on in them.
    As we know, it's important10 a balanced diet(均衡饮食). We must have the right kinds of food. We should also eat some pork, chicken and beef. We should eat more fruit and vegetables but less meat.

光明小学买4张桌子、4把椅子共付480元，每张桌子的价钱是每把椅子的3倍．每张桌子____钱?

《论民主》一书中指出，“希腊人的政治体制是……一种乡镇会议式的民主”。其依据是（    ）

世界第六个迪士尼主题公园——上海迪士尼乐园，于2016年6月16日正式开业。读“迪士尼乐园全球分布图”，回答下面小题。