Period 5(Section B 3a－Self Check)一、阅读理解Your brain controls everything you do. It makes it possible for you to think, learn, create and feel; to blink(眨眼) and breathe and for your heart to beat—this fantastic control center is your brain. It is so amazing that a famous scientist once called it “the most complex(复杂的) thing we have yet discovered in our universe”．Can this small grey organ(器官), which weighs less than one and a half kilos, really do so much? Amazingly, your brain contains about 100 billion neurons(神经元)—it would take you over 3，000 years to count them all. Believe it or not, the activity in your brain never stops. Your neurons create and send more messages than all the phones in the world. And although one neuron creates only a little electricity, all your neurons together can produce enough electricity to power a light bulb(灯泡)．So exactly how fast does your brain work? Well, imagine this: A bee lands on your foot. Neurons in your skin send this information to your brain at a speed of more than 240 kilometers per hour. Your brain then uses other neurons to send the message back to your foot to shake the bee off quickly. These neurons can send this information at more than 320 kilometers per hour. No computer has your brain's unbelievable ability to deal with the amount of information coming from your eyes, ears and other sensory organs.But how does your brain allow you to learn things that you will use in the future? The structure(结构) of your brain changes every time you have a new thought, remember or learn something. For example, riding a bike seems impossible at first, but soon you are able to do it. How? As you practice, your brain sends “bike riding”messages again and again. Soon, the actions are learned and you are able to ride a bike easily from then on.()1.From the passage we know that neurons ________．A．receive messages very slowlyB．are only found in your skinC．send messages to your brainD．need electricity to work()2.In Paragraph 3, the writer mentions computers to ________．A．compare them with the human brainB．show how fast they have becomeC．say that computers have no abilitiesD．ask people to use computers more()3.When you have a new thought, ________．A．your brain will power a light bulbB．your heart beats fasterC．you remember somethingD．the structure of your brain changes()4.The article is mainly about ________．A．all the steps when your brain learns thingsB．what an unbelievable organ the human brain isC．how the brain makes people smarter than computersD．the things you can do to make your brain work faster二、用方框中所给单词的适当形式填空express wise able increase conversation1．We only have a little time together, so we try to spend it ________．2．The ________ on her face told me that she didn't want to discuss it.3．The number of teachers in our school has ________ from 100 to 120.4．A sweet smile is the best way to show your kindness and start a(n) ________．5．After the accident she lost the ________ to walk.三、根据中文提示完成短文Last week, I returned from England after three months of living abroad as an international exchange student(交换生). Now, I have a wider 1________(知识) of Britain than before. I am very excited to share some of my fantastic experiences.You know I'm a(n) 2________(活跃的) person. I'm not afraid to speak 3________(大声地) in public. During my stay, I lived with a British host family named the Atkinsons. They were very nice and we got along well with each other. They have a son named George. He was 4________(出生) in the same year as me. As soon as I came to his family, he became my 5________(同伴) both in life and study. He told me that my 6________(发音) was excellent, but I made mistakes in 7________(语法) sometimes. So I decided to take a(n) 8________(笔记) whenever I made a mistake. This is the 9________(秘密) of my doing well in English.The Atkinsons were friendly. They always cooked delicious meals for me. And they taught me many interesting things that I could never learn from 10________(课本). I also made lots of friends. So, at the end of the third month, I almost didn't want to come back home!四、语法填空阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。
