短文理解  阅读下列短文，从每题所给的A、B、C三个选项中，选出最佳选项回答问题或完成句子。

    Why is clean water so important to developing countries? A recent report shows that about 80 percent of diseases in developing countries are caused by poor water and low sanitation（卫生）conditions. In those countries, women and girls spend several hours collecting water, but often polluted, far away from their families. The polluted water more or less influences their health. In this case, there is an urgent（迫切的）need for people in developing countries to have access to（有机会或权利使用）clean water to improve their health.

    Here is a short story about Hadjara Zakari, a 12-year-old girl in Niger. Having access to clean water changed her life. She learned about the importance of hand-washing when the school first received clean water three years ago. That evening, she told her father, "You shouldn't eat with me unless you clean your hands." Her father was very angry and shouted at her, "It's not up to you to tell me what to do!"Stunned（目瞪口呆的），Hadjara sat in silence. But she knew she was right. In protest,Hadjara refused to eat dinner that night. After her father questioned Hadjara's head teacher, he understood the importance of hand-washing and his daughter's intentions（目的）. The girl really wanted her family to live longer and healthier lives.

    For people in developing countries, clean water can change many things, especially improve their health. So, from now on, let's avoid wasting water and take action to save water, which is important to people all over the world.

    Have you heard about "Face Recognition (刷脸)" technology? It begins to become a popular and exciting development in China. In September 2017, a Kentucky Fried Chicken KPRO restaurant in Hangzhou utilized (利用) this new technology.

    Customers will go through the buffet (自助餐) line and then check out with their food using this "Just look with your face" payment method. When they get to the payment machine, they simply choose the Payment of facial recognition and then stand in front of the screen for 1-2 seconds. They then confirm their account and phone number and finish the payment process—all of it takes no more than 10 seconds!

    Nowadays, the words "Face Recognition" have become popular around China with the development of the ability to pay with facial recognition. Here are several examples of how you might hear the words in daily life in China. In Hangzhou, a high school provides a service where students can pay for meals by facial recognition. However, this isn't the only way we use the words in China! When you combine these characters together you also get another meaning: Jackie Chan got a dinner for free by "brushing his face".

    Do you know more about other meanings of "Face Recognition"? Please tell me more about it by sending an email to Susan2018@126.com or call me at 8524689. We'll talk about the topic next time.

    Frank is a small schoolboy. His school has so many rules for 1. He doesn't like any of them because he thinks they are all 2."The school asks us not to do this 3that. I'm not happy about it," He often says.

    Frank can swim. He always wants to 4how good he is at swimming. One day he comes to the lake in his school. There is a school rule about this lake: Don't 5in it! Frank doesn't like the rule and he jumps into it.

    When he is in the lake, he finds he is 6. The lake is so deep and the water in it 7very dirty. He feels terrible and can't swim well in the lake. He needs 8 The two teachers come and help 9out of the lake. From that day on, he knows it's important to 10the school rules.

    What do you think of the school rules in your school?

Bill was a boy of 15. His parents went to gambling (赌博) day and night. 

Nobody cared about him. He always failed in his exams. So his teachers didn't like him, nor did his classmates play with him. Bill often slept in class because his heart was not in school. He almost gave himself up. 

One day, Miss Jones, a new teacher, came to Bill's class. She was a smiling, beautiful woman. Bill was in love! For the first time in his young life, he couldn't take his eyes off his teacher. 

It was Miss Jones' class. She was asking a question. "I'd like the smartest boy to answer my question. " Then she said loudly, "Bill, please!" Bill was surprised. And he stood up without a word. 

"Just try it! I believe you can!" After school, Miss Jones had a long talk with Bill. She told him that she cared about him and believed in him. 

Bill thought a lot that evening. From then on, he arrived at school on time every day. Miss Jones helped him with his homework in the afternoon. She even cooked delicious food for him. She told Bill, "Nothing is impossible if you put your heart in it. "

Later, Miss Jones gave another exam. Bill did it with all his heart. He was very excited to find that he had passed the exam. Now Bill discovered that not only could he learn, but he could do it well. A change took place in Bill's heart. 

You see, one teacher saved one boy. It's simple, really. 

Some animals can easily find their way home after a long journey. How do they make it? Scientific research shows that they are born with certain unusual abilities for direction.

A certain kind of ants, for example, can count their steps to avoid getting lost. They can go as far as 110 metres and bring food home. These ants live in the open desert (沙漠), so they have nothing to guide them along the way. It's like someone walking six kilometres through a dark forest.

Some fish have an unbelievable sense of smell. They can smell even a single drop of their home water in a large sea area. Some sea birds have a similar ability. They are able to make a smell map of their flying area.

Some animals can sense the earth's magnetic field (磁场), while humans can't. This magnetic field guides a certain kind of fish when they swim a long way to a place and then back. How can this kind of fish do that? It is still a mystery. Scientists have no good answers yet.

However, animals with such unusual abilities still have difficulty dealing with environmental changes caused by human activities. For example, many birds depend on stars for direction, but they get lost easily at night when city lights are kept on all night. To solve this problem, we can simply turn off some lights at night. Clearly, one small act of humans may mean a lot to animals.