分式 $-\frac{1}{1-x}$ 可变形为（    ）

在△ABC中，∠B=∠A+5°，∠C=∠B+5°，求△ABC的各内角的度数．

右边漫画的寓意是（）

①强意志是战胜困难、克服弱点、取得成功的保证；
②意志薄弱者，会在挫折和失败而前退缩，不易成功；
③做事不能善始善终，会丧失成就人生的良机；
④意志品质有强弱之分，要磨砺坚强意志 

47年前，39岁的屠呦呦带领团队收集了2000多种方药，不断筛选、改进提取方法…十年如一日，终于发现了青蒿素，解决了全球数亿疟疾患者的困扰，2015年10月85岁高龄的屠呦呦因此获得诺贝尔生理学或医学奖。屠呦呦的事迹给我们的启示是（  ）

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    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.