Junior school students in Harbin，Heilongjiang，had a "long weekend"．They had four days off from Oct．19-22．It was not for any festival，but was caused by serious smog．

The smog was caused by high levels of PM 2．5 in the air．

PM 2．5 is small particles（微粒） of pollution in the air with a diameter （直径） of 2．5 micrometers or less．Waste gas from cars and factories is the biggest cause of PM 2．5 pollution． On Oct．17，the World Health Organization named air pollution a cause of cancer．

To better protect children，cities are taking action．

On Oct．21，Harbin Education Bureau decided to close primary and junior high schools for two days．

??? Beijing started a program on Oct．22 which has a warning system with four levels．The red warning is the highest warning level．It means that the next three days will see serious pollution．

When a red warning is issued（发布），schools will close．

If there's pollution that's not as serious，the Beijing Commission of Education will ask schools to stop PE classes and outdoor activities．

How will students be informed?

"First，the Commission of Education will inform schools online，" Ye Yan，head of Beijing Shijingshanqu Experimental Primary School，told Beijing Times．"Then teachers will text students’ parents．"

Will the days off affect the study plan?

"Missing school days will be made up during the summer or winter vacations，"? said Wang Hao，a physical education teacher in Beijing Chaoyang district．

For students in Harbin who had the long weekend，they would go to school on the next two Saturdays．

根据材料内容选出最佳选项，并在答题卡上将该项涂黑。

1.Why did students in Harbin have a long weekend?

A． Because the weather was extremely cold．? ?????????????

B． Because a special festival came．

C．Because the winter vacation began．??????? ?????????????

D．Because there happened serious smog．

2.Which of the following is TRUE about PM 2．5?

A．It makes water polluted．? ????????????? ????????????? ????????????? ????????????? ?????????????

B．People can see it with eyes．

C．It only comes from factories． ????????????? ????????????? ????????????? ?????????????

D．It can cause serious diseases．

3.When a red warning is issued in Beijing，what will happen?

A．All of the work will be stopped．????????????? ????????????? ????????????? ?????????????

B．People aren't allowed to go outside．

C．Schools will be closed for a few days．????????????? ?????????????

D．Air pollution will be seen in a few weeks．

4.What does the underlined word "text" mean in Chinese?

A．写信????????????? ????????????? ????????????? B．发信息????????????? ????????????? C．写文章????????????? ????????????? D．发邮件

5.What is the reading mainly about?

A．What PM 2．5 is made up of．????????????? ????????????? ????????????? ?????????????

B．How people fight against air pollution．

C．What influence the smog brings to school．????????????? ?????????????

D．How schools deal with the missing school days．

For many in the United States, Arab-Americans are an invisible part of the population. Though Arab-Americans as a community have made great contributions to American society in fields from literature to politics to medicine, many Americans know very little about Americans of Arab backgrounds.

Arab history in the United States goes back to the late 1800’s when large numbers of Arab immigrants first began making their journey to a land known simply as “Amreeka”.

Historians generally describe Arab immigration to America in two waves. The first wave took place between 1860 and 1924.The first wave consisted of Lebanese and Syrian, and some Egyptian immigrants. These new immigrants, who were mostly Christian, came to America in search of better opportunities. Even the doomed Titanic, which set sail for America in 1912,had close to a hundred Arab passengers aboard. The majority of Arab-Americans today are descendents of the first wave of immigrants; they are the third or more generation Americans.

The second wave of immigrants followed after World War Ⅱ,caused by political unrest in the Middle East. This second wave of immigrants consists of mainly Arab Muslims（穆斯林）and continues to this day.

Arab-Americans make up 3 million of the population in the United States, according to demographers. And quite different from popular belief, 64 percent of them are American-born. Eighty-two percent of Arab-Americans are US citizens.

Arab-Americans are beyond the national average in both education and income. Education is important among Arab-Americans; 82 percent have high school diplomas, 36 percent have bachelor’s degrees or higher, and 15 percent have graduate degrees. The-median（中位数的）average income among Arab-Americans is $39,580, which is higher than the US average.

1.The first wave of immigrants took place because__________.

A. all Arabs were Christian at that time

B. Arabs wanted to gain higher income

C. the Second World War broke out

D. Arabs wanted to hunt for a better development

2.The writer of this passage mentioned Titanic__________.

A. to tell us that taking ship at that time was dangerous

B. because Titanic became a well-known disaster

C. to show us there were many Arabs flocking into America at that time

D. to inform us that Arabs are brave enough

3.From the last paragraph we can infer that__________.

A. Arab-Americans are much more clever than native Americans

B. the higher education you receive, the higher income you will get in America

C. Arab-Americans are hard-working people

D. The-median average income among Americans is $39,580

4.Which of the following sentences is TRUE？

A. Arab-Americans have made great contributions to American society only in literature.

B. Arab history in the United States is to the early 1800’s.

C. The first Arab immigration to America took place between 1860 and 1924.

D. Few of Arab-Americans are US citizens.

5. What would be the best title for the text?

A. Arabs in America.

B. The Two Arab Immigration Waves to America.

C. Arab-Americans, Contributions to America.

D. Arab-Americans, Education and Income.

Napping(小睡) after learning something new could help improve your memory--- as long as you dream, scientists say.
They found people who dream about a new task do it better on waking than those who do not sleep or do not dream.
Volunteers were asked to learn the layout(布局，设计) of a 3D computer maze(迷宫) so they could find their way several hours later. Those allowed to take a pap and who also remembered dreaming of the task, found their way to a landmark quicker.
The researchers think the dreams are a sign that unconscious(无意识的) parts of the brain are working hard to process information about the task..
Dr. Robert Stickgold of Harvard Medical School, said dreams may be a marker that the brain is working on the same problem at many levels.
Study tips
Co-author Dr. Erin Wamsley said the study suggests our non-conscious brain works on the things that it deem(认为) are the most important.
“Every day we are gathering lots of information and new experiences,” she said. “It would seem that our dreams are asking the question, “How do I use this information to inform(影响) my life?”
The scientists say there may be ways to use this phenomenon(现象) for improving learning and memory. For example, students might be better studying hard before bedtime, or taking a nap after a period of afternoon study.
【小题1】 Scientists say ______ could help improve your memory.

A rabbit is running into its hole. You may ask, “What happened?”
Well, when a rabbit sees something dangerous, it runs away. Its tail moves up and down as it runs. When other rabbits see this tail moving up and down, they run too. They know that there is danger. The rabbit has told them something without making a sound. It has given them a signal.
Many other animals use this kind of language. When a bee found some food, it goes back to his home. It cannot tell the other bees where the food is by speaking to them, but it does a little dance in the air. This tells the bees where the food is.
Some animals say things by making sounds. A dog barks, for example, when a stranger
comes near. A cat purrs (发出呼噜呼噜的声音)when pleased. Some birds make several different sounds, each with its own meaning.
But human beings have something that no animals have –-- a large number of words about things, actions, feelings or ideas. We are able to give each other information, to tell or inform other people what is in our mind or how we feel. By writing words down we can remind ourselves of the things what have happened, or send messages to people far away. No animals can do this. No animals has the wonderful power of language.
No one knows how man learned to make words. Somehow he learned to make them. As centuries went by, he made more and more new words. This is what we mean by language.  People living in different countries made different kinds of words. Today there are about fifteen hundred different languages in the world. A very large English dictionary, for example,  contains four or five hundred thousand words. But we do not know all these. The words we know are called vocabulary. We should try to make our vocabulary larger. Read as many books as possible. When we meet a new word, look it up in the dictionary. A dictionary is the Most useful book.
【小题1】 When a rabbit gives the other rabbits a signal of danger, it _______.

A rabbit is running into his hole. You may ask, “What happened?”
Well, when a rabbit sees something dangerous, it runs away. Its tail moves up and down as it runs. When other rabbits see this tail moving up and down, they ran, too. They know there is danger. The rabbit has told them something without making a sound. It has given them a signal.
Many other animals use this kind of language. When a bee finds some food, it goes back to his home. It can’t tell the other bees where the food is by speaking to them, but it does dance in the air. This tells the bees where the food is.
But animals say things by making sounds. A dog barks, for examples, when a stranger comes near. A cat purrs(发出呼噜呼噜的声音) when pleased. Some birds make several different sounds, each with its own meaning.
But human beings have something that no animals have---- a large number of words about things, actions, feelings or ideas. We are able to give each other information to tell or inform other people what is in our mind or how we feel. By writing words down we can remind ourselves of the things that have happened, or send messages to people far away. No animals can do this. No animals has the wonderful power of language.
No one knows how man learned to make words. Somehow he learned to make them. As centuries went by, he made more and more new words. This is what we mean by language.
People in different countries made different kinds of words. Today there are about fifteen hundred different languages in the world. A very large English dictionary, for examples, contains four or five hundred thousand words. But we don’t know all these. The words we know are called vocabulary. We should try to make our vocabulary larger. Read as many books as possible. When we met a new word, look it up in the dictionary. A dictionary is the most useful book.
【小题1】What’s the meaning of the underlined word?