Eating too much fatty food, exercising too little and smoking can raise your future risk of heart disease. But there is another factor that can cause your heart problems more immediately: the air you breathe.
Previous studies have linked high exposure (暴露）to environmental pollution to an increased risk of heart problem, but two analyses now show that poor air quality can lead to heart attack or stroke (中风）within as little as a few hours after exposure. In one review of the research, scientists found that people exposed to high levels of pollutants (污染物）were up to 5% more likely to suffer a heart attack within days of exposure than those with lower exposure. A separate study of stroke patients showed that even air that the U. S. Environmental Protection Agency (EPA) considers to be of “moderate” (良好）quality and relatively safe for our health can raise the risk of stroke as much as 34% within 12 to 14 hours of exposure.
The authors of both studies stress that these risks are relatively small for healthy people and certainly modest compared with other risk factors such as smoking and high blood pressure. However, it is important to be aware of these dangers because everyone is exposed to air pollution regardless of lifestyle choices. So stricter regulation by the EPA of pollutants may not only improve environmental air quality but could also become necessary to protect public health.
【小题1】The text mainly discusses the relationship between        .

短文改错（共10小题，每小题1分，满分10分）
文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号（^）。并在其下面写出该加的词。
删除：把多余的词用斜线（/）划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：1. 每处错误及其修改均仅限一词；
2. 只允许修改10处，多者（从第11处起）不记分。
British public library are linked by computers. If your  nearest library in London doesn't have the book you want  borrow it, the librarian will go on-line to see whether any   other nearby library has. If no library in London have the book   in store, the librarian will search it further, connecting libraries in other city like Manchester. If a copy of the book   found, arrangements will be made for it to be sent to your  library within a day and two, and you will  be able to check it out. It is also possibly for readers to     borrow books from university and college libraries even if we are not students.        

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
How to Make Friends
Friendship is a very important human relationship and everyone needs good friends.  Good friendship has many benefits. It offers companionship, improves self-worth and promotes good health.  There are times in our lives such as when we have recently moved into a new town, or changed our jobs or schools.  Such changes often leaves us without a friend 【小题1】  51 .  But for many of us the process is difficult and requires courage. Below are some helpful suggestions on how to make and keep friends.
Associate with others.
The first step to making friends is associating with other people. You can go to public places to meet new people. Besides, you will need to make yourself known by becoming an active member of such places.
Start a conversation
Starting a conversation is the second most important step in making new friends.  【小题2】  You can always start the conversation. Being able to make small talk is a very useful skill in relating with other people.
【小题3】   
Choosing friends with common interests is important in building friendship as these interests would always bring you and your friend together, Hanging out will always be a pleasant experience.
Let it grow.
It is a good thing to stay in touch. However, try not to press your new friend with calls, messages or visits as this would likely wear him or her out and finally you may lose your friend.   【小题4】  .  The best friendships are the ones that grow naturally.
Enjoy your friendship
The best way to enjoy your friendship is to allow your friends to be themselves.  【小题5】  Try not to change them from who they are to what you want them to be. Become the kind of friend you will want your friend to be to you.

“In only six days I lost seven pounds of weight.”
“Two full inches in the first three days！”
These are the kinds of statements used in magazine，newspaper，radio and television ads，promising new shapes and new looks to those who buy the medicine or the device. The promoters of products say they can shape the legs，slim the face，smooth wrinkles，or in some other way to add to beauty or desirability.
Often such products are nothing more than money­making things for their promoters. The results they produce are questionable，and some are dangerous to health.
To understand how these products can be legally promoted to the public，it is necessary to understand something of the laws covering their regulation. If the product is a drug，FDA(Food and Drug Administration)can require proof under the Food，Drug，and Cosmetic Act that is safe and effective before it is put on the market. But if the product is a device，FDA has no authority to require premarketing proof of safety or effectiveness. If a product already on the market is a danger to health，FDA can request the producer or distributor to remove it from the market voluntarily， or it can take legal action，including seizure(查封)of the product.
One notable case a few years ago involved an electrical device called the Relaxacisor，which had been sold for reducing the waistline (腰围). The Relaxacisor produced electrical shocks to the body through contact pads. FDA took legal action against the distributor to stop the sale of the device on the grounds that it was dangerous to health and life.
Obviously，most of the devices on the market have never been the subject of court proceedings(法律诉讼)，and new devices appear continually. Before buying，it is up to the consumer to judge the safety or effectiveness of such items.
【小题1】It can be inferred that the ads mentioned in the text are________.

The Sydney Opera House is a very famous building in the world. It has become Sydney's best-known landmark and international symbol. The Opera House with a " sailing roof" was designed by a famous Danish architect (丹麦建筑大师),Utzon. The base for the building was started in 1959, years before the designs were finished. Utzon spent four years designing the Opera House. In 1962, the designs were finalized (定稿) and the construction began. In 1967, they started the decoration inside. It took 14 years in total to build the Opera House. Queen Elizabeth II officially opened it on October 20th, 1973.
　 The Sydney Opera House cost around $100 million and was paid for by the public 6,225 square meters of glass was used to build it. The Opera House includes 1,000 rooms. It is 185 meters long and 120 meters wide. The building's roof sections weigh about 15 tons. Each year, this fantastic building attracts 200,000 tourists to come for a visit or enjoy events in it.
　  The Opera House reaches out into the harbour (港湾). It is amazing and unforgettable, offering people a strong sense of beauty.
【小题1】The designer of the Sydney Opera House was from _______.