The human body is a machine that can raise lots of interesting questions．Why，for example，are yawns（呵欠）contagious（传染的）？What's up with ice﹣cream headaches？ Here are answers to these and other questions about our bodies．
Why do I get a headache when I eat ice cream too quickly？
Scientists aren' t exactly sure what causes the brain freeze when we eat ice cream or other super﹣cold foods too quickly，though some believe it's the result of changed blood flow in the nervous stem．Blood vessels in the head tighten to stop the loss of body heat and then relax to let blood flow rise；that sudden rush of blood is what causes the headache．You can improve an ice﹣cream headache by rapidly rubbing your tongue across the roof of your mouth to help warm up things．
What causes my stomach to make a low continuous noise when I'm hungry？
Actually，your stomach makes noise whether you're hungry or full；you just hear it more clearly when you're hungry．Think of your digestive tract（消化道）as a really long tube lined with smooth muscle tissue． These muscles move food，fluids and gas through your digestive tract． A ．It can make you feel embarrassed（尴尬的） but is nothing to worry about．
Why do I blush when I'm embarrassed？
When you're embarrassed，your brain releases a shot of adrenaline（肾上腺素），which makes your heart race and blood vessels become larger in size．All this happens to increase blood flow and oxygen delivery throughout the body in a fight﹣on﹣ flight reaction（对抗反应）．There are a lot of tiny blood vessels in your face，which turn noticeably redder from this sudden rush of blood．As for the actual function of blushing，researchers are still trying to find that one out．
Why are yawns contagious？
Have you ever yawned in front of someone，only to have them yawn right back？ It's a common thing but researchers don't have a good explanation for it．They do，however，know this happens only with humans and chimpanzees（ 黑猩猩）．A bigger question puzzling scientists is why we yawn at all It used to be thought that yawning showed that oxygen to the brain was not enough，but that's just a myth．A growing body of research now shows that yawning is nature's way of keeping our brains cool．
（1）What is the meaning of the underlined word tighten？ ．
A．变松
B．变紧
C．变短
D．变长
（2）Which of the following sentences can be filled in the blank？ ．
A．And that's what you're hearing when your stomach makes noise．
B And that's why you're so hungry when your stomach is empty．
C．And that's what makes you feel uncomfortable when you're full．
D．And that's how it makes a difference to your digestive tract．
（3）Which of the following statements is TRUE？ ．
A．There is no way for you to improve an ice﹣cream headache．
B．Researchers have found out the actual function of blushing．
C．Your stomach makes noise only when you are hungry．
D．Researchers don't have a good explanation for why yawns are contagious．
（4）What is the best title of the passage？ ．
A．Some Interesting Facts
B．Our Strange Body
C．Some Useful Discoveries
D．Our Amazing Feelings
| School Open Day |
||
| Time |
Activity |
Place |
| 8:00 a.m. |
See the students’ art works |
Art room |
| 9:00 a.m. |
Watch the students doing morning exercises |
Playground |
| 9:30 a.m. |
Have a parents’ meeting |
School hall |
| 10:00 a.m. |
Watch two lessons (English & Maths) |
Classroom building |
| 1:00 p.m. |
Have the music party (about 1.5 hours) |
Music room |
Tom’s mum can go to the _______ to see art works.
| A．music room | B．school hall |
| C．art room | D．playground |
Jack’s dad gets to school at 9:20 a.m, so he is late for _______.
| A．the English lesson | B．the music party |
| C．the parents’ meeting | D．morning exercises |
How long does the Open Day last (持续)?
| A．About 5 hours. | B．Over (超过) 6 hours． |
| C．Over 7 hours. | D．5.5 hours. |
English breakfast is a very big meal:eggs, tomatoes, tea, coffee and so on. But lunch is a quick meal.In many cities, there are a lot of sandwich bars (三明治吧).School children can have hot meal at school.But many just take a sandwich, a drink and some fruit from home.
In England, people often have a cup of tea with sandwiches or cakes in the afternoon.They usually have the evening meal early, between six o’clock and eight o’clock.The family often eat together. On Sundays many families have a traditional lunch.They have chicken,pork...with potatoes and vegetables.
English people also like other countries’food, such as French, Chinese, Italian and Indian.
People often get take-away meals-they buy the food outside and then bring it home to eat.Many people in England have a ______ breakfast and a ______lunch.
A. fast; small B.little; slow C.big; quickThe English people usually have supper at _________.
A.9.00 pm B.7.00 pm C.5.00 pmWhat does the word take-away mean (意思) in this article(文章)?
A.自己取的 B.西式的 C.可以带走的What don’t English people have when they have afternoon tea?
A.Chicken. B.Sandwiches. C.Cakes.Which is NOT true about the passage?
A.On Sundays, people in England often have a traditional meal.
B.English people also like Indian and Italian food.
C.English people usually eat take-away food in the fast food shop.
Mum gives little Tom ten yuan. Then little Tom goes shopping. He gets on the bus and sits down next to an old woman. Then he sees the old woman’s bag is open. There is ten yuan in it. He quickly looks into his pocket. The money isn’t there now! Little Tom is sure that the old woman is a thief（小偷）. He decides（决定）to take back the money from the old woman’s bag. So he carefully puts his hand into the old woman’s bag，takes the money and says nothing. Suddenly（突然地）the old woman shouts，“Where is my money? I can’t find it. There is a thief in the bus.” Little Tom feels strange（奇怪的）. Then he sees his own ten yuan under his seat. Little Tom is thinking a question now，“Am I a thief ?”is sitting beside little Tom.
| A．A young woman | B．An old woman |
| C．A young man | D．An old man |
Little Tom sees in the old woman’s bag.
| A．a wallet | B．a packet |
| C．ten yuan | D．ten dollars |
Little Tom is sure that the old woman is a at the beginning（开始）.
| A．thief | B．teacher |
| C．rich woman | D．poor woman |
Little Tom sees ten yuan under his seat.
| A．his own | B．the old woman’ s |
| C．the thief’ s | D．the driver’ s |
Which of the following is right?
| A．Little Tom is a bad boy. |
| B．Little Tom often steals（偷）things. |
| C．Mum gives little Tom twenty yuan. |
| D．Little Tom makes a mistake（错误） |
Everyone tries to get to school on time. But when bad weather gives you trouble（麻烦）, can you still make it before the bell rings?
In northern China during spring, big sandstorms（沙尘暴）often make trouble for students and everyone else. When the sky is dark with sand, buses and cars all move much more slowly. Sometimes, people can’t even see for 20 metres.
Sandstorms usually happen in spring. This year, sandstorms started in late March. They have happened in more than 10 provinces (省) in northern China this year. More than 70 million people have had problems in those places because of the sandstorms.
People in southern China don’t have to worry about this kind of bad weather. Most of the sand comes from Gansu and Inner Mongolia（内蒙古）. In northern China, lots of places have few trees and don’t get much rain. People there have been cutting down too many trees. When there aren’t many trees, the ground can’t keep enough water. Over the years, the ground dries up and turns to sand. When spring comes and the ice melts（融化）, the ground becomes looser（更松散的）. Strong winds take the loose sand into the sky.
Sandstorms are bad for people’s health. If people breathe（呼吸） too much sand, they could cough or have asthma（哮喘）.
Sandstorms also give farmers lots of problems. Sometimes their sheep get lost in the storms and never get back home. The winds also tear down farmers’ houses.
What can you do to stop sandstorms? Here’s an idea: Ask your parents to help you plant some trees this spring.
If you see people cutting down too many trees, tell them about the dangers of sandstorms, and ask your government to stop them from cutting. In which season do sandstorms usually happen?
| A．In spring. | B．In summer. |
| C．In autumn. | D．In winter. |
Which of the following provinces in China is often hit by sandstorms?
| A．Fujian Province. | B．Yunnan Province. |
| C．Jiangsu Province | D．Gansu Province. |
The underlined phrase “tear down” in the sentence means “_________”.
| A．使……哭泣 | B．弄倒 | C．摧残 | D．加固 |
According to the passage, what cannot be caused by sandstorms?
| A．Health problems. |
| B．Traffic problems. |
| C．The loss of farm animals. |
| D．Noise pollution. |
Which is not stated in the passage？_______________ .
| A．Trees can help keep enough rain water |
| B．More trees need to be planted |
| C．Some people are doing harm to the environment |
| D．Sandstorms are the main cause of asthma（哮喘） |
In nature, you may see many insects (昆虫）and animals of different colors. Have you ever wondered why?
Locusts are super delicious food for birds, but it is not always an easy job for birds to catch them. It is neither because locusts are good jumpers or runners nor because they are smarter than their enemies. The reason is that the colors of locusts change with the colors of crops(庄稼). When crops are young, locusts look green. But when autumn comes, locusts change to the yellow and brown color as crops do.
Brown bears, tigers and other animals move quietly through forests. They can’t be seen easily by their enemies. This is because they have colors similar to the trees. For the same reason, polar bears that live on a land of snow and ice are white. Butterflies and bees living among the flowers are colorful like flowers. Soil insects are mostly dark-colored and they live under the soil(土壤）in a dark and wet environment. However, insects with colors different from plants can easily be found and eaten by others. So in order to survive, they have to hide themselves in the daytime and appear only at night.
Have you ever noticed some even stranger acts? The ink fish in the sea can send out some very black ink when it faces danger. As the ink spreads over, its enemies will find themselves suddenly in a dark world. At the same time the ink fish immediately swims away. That is how it keeps itself safe though it is not strong at all.It is not easy for birds to catch locusts because____________. .
| A．locusts are good runners |
| B．locusts can jump very high |
| C．locusts are smarter than birds |
| D．locusts can change their color |
According to the passage, most soil insects_________
| A．do not have bright colors |
| B．change their colors with the soil |
| C．do not live in a dark and wet environment |
| D．Eat colorful insects like butterflies and bees |
What’s the meaning of the underlined word “survive” in the passage?
| A．繁殖 | B．产卵 | C．觅食 | D．生存 |
The ink fish_______so that its enemies will not see it?
| A．changes its color |
| B．makes the water around it black |
| C．appears only at night |
| D．hides itself in the sea rocks |
What is the main ides of this passage?
| A．Some insects and animals have different skills. |
| B．Some insects and animals are clever than we think. |
| C．Some insects and animals use colors to protect themselves. |
| D．Some insects and animals can get used to the environment easily. |