Zhang Lei is a highly skilled doctor. He was born in a lonely ________ village. The people there lived a hard life. They seldom walked out of the mountain. They could ________ get good education. However, Zhang Lei was ________, for he not only went to college, but he also became an excellent doctor. Then what made him lucky? A volunteer teacher called Han Xue encouraged him, and ________ his life.

When Han Xue first entered Zhang Lei’s school, she couldn’t ________ her eyes. She was shocked by the sights (情景) in front of her: broken windows, small old desks and chairs. Even worse, students of different ages were in the ________ classroom. It was the only class in the school. Han Xue realized ________ poor the people there were in education. She planned to ________ as many ways as she could to help them. One day when Han Xue was giving a class, Zhang Lei ________ some noise for fun. Other kids laughed. At that time Han Xue decided to make good use of the ________ to help him. She walked towards Zhang Lei and asked him to put out his hands. Looking at them ________, Han Xue said with a kind smile, “As soon as I see your little ________, I know you will become a highly skilled doctor in the future. Come on!” Hearing this, Zhang Lei was surprised because almost ________ said such words this way. Zhang Lei couldn’t believe that completely, but he remembered what the teacher said in his heart.

After that, Zhang Lei studied harder and then made more ________ continuously (持续地). Later, Zhang Lei went to college. After many years, he became a famous doctor, saving many lives. ________ Zhang Lei talks about his life, he always expresses thanks to his volunteer teacher. Her encouraging words have made what he is.

A myth is something that is not correct, but many people believe. There are a lot of myths about the human brain.

One of the biggest myths is that we only use 10 percent of our brains. The next part of the myth is that if we can learn to use the rest of our brains, then we'll be much smarter. People say this all the time, but it's absolutely not true! The truth is that although we don't know everything about the human brain, we know that each part of it has an important function (功能) . Modern scientists think the "10 percent myth" ridiculous (荒谬的) .

The other most popular myth is about being "right brained" or "left brained". According to this myth, people who use the right side of their brains are more artistic and creative. People who use the left side of their brains are better at math and science. This is as popular as the 10 percent myth, and it's also wrong. In 2013, a study at an American university examined the right brain and left brain myth. According to the study, we use both sides of our brains equally (相等地). "       

It's true that we use different parts of our brains for different things. We use our left side for language more, and our right side when we need to pay attention. But there is no evidence (证据) that creative people use the right side more or that scientific people use the left side more.

We've talked about myths, so let's look at a few interesting facts about the brain. First of all, the brain feels no pain. Second, about 75 percent of the brain is made of water. It's also the fattest organ in your body. Here's another interesting fact about the brain. Around the time you turn 18 years old, it stops growing.