It’s ten years since the scientist ____ on his life’s work of discovering the valuable chemical.

A．made for          B．set out            C．blocked out        D．turned up

 My colleague has been recovering gradually since the operation, and it wont’ be long ______ he comes back to work．

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空。

Since the one-baby policy __1.____(carry) out in China, Chinese families have been shrinking from one with over 10 members to the other with only three including parents and baaby. Things are usually out of our expectation. Apart from the benefits ___2.____ have been mentioned enough, small families are now beginning to have ___3.___own problems. Because parents are having fewer children, they increasingly feel the need ___4.____(control) the lives of those children. As a result, many children are becoming less ___5.____(depend), determined and ambitious than in the past.

? Parents today discourage their children from doing housework, extracurricular activities and socializing ___6.___ they fear it will interrupt their education. For example, when I was younger I wanted to learn the guitar ___7.___ my parents wouldn’t allow me because they believed it would distract me from my studies. They are happy as long as I perform ___8.___(wonder) in my exams but don’t seem concerned about how I develop ___9.___ a person.

? To some extent, I understand parents’ concerns, but I think they should love their children for __10.__ they are, not what they want them to be. We deserve the chance to chase our own dreams and learn on our own. Even if we fail, we can learn from those failures.

Internet use appears to cause a drop in psychological health, according to a research at Carnegie Mellon University.

Even people who spent just a few hours a week on the Internet experienced more depression(沮丧) and loneliness than those who used Internet less frequently, the two-year study showed. And it wasn’t that people who were already feeling bad spent more time on the Internet, but that using the Net actually appeared to cause the bad feeling.

Researchers are puzzled by the results, which were completely the opposite to their experiences. They expected that the Net would prove socially healthier than television, since the Net allows users to choose the information and to communicate with others.

The fact that Internet use reduces time available for family and friends may explain the drop in well-being, researchers supposed. Faceless, bodiless “virtual” communication may be less psychologically satisfying than actual conversation, and the relationships formed through it may be shallower. Another possibility is that knowing the wider world via the Net makes users less satisfied with their lives.

“But it’s important to remember this is not about the technology; it’s about how it is used,” says psychologist Christine Riley of Intel, one of the study founders. “It really points to the need for considering social factors in terms of how you design applications(应用) and services for technology.”

1.The best title of the passage probably is        .

A．Internet May Cause Depression

B．The Danger of Internet

C．Communication with Others by Internet

D．Puzzled by the Results

2.Why did the results of research puzzle the researchers?

A．People could choose their information through Internet.

B．They had expected the opposite results.

C．People can communicate with others.

D．They had thought Internet was much healthier.

3.Which of the following may be the cause of depression?

A．Net users found their living conditions bad.

B．Net users already had mental problems.

C．Deep relationships were formed through Internet.

D．Net users had less time to communicate with other people.

4.The writer’s attitude towards technology is        .

A．social factors must be considered while using technology

B．technology was to blame for depression

C．the problem doesn’t lie in technology

D．applications and services for technology must be designed

The United States of America is the most culturally diverse(多样化) country in the world in terms of culture religion, ethnicity(种族) and sexual orientation. As a combination of various races and cultures, America is home to all. The culture here is so unique that citizens can be just as proud of their original cultural heritage(遗产) as they are to be American.

What is now the US was initially inhabited(居住) by native people until the land was settled by various European groups and African slaves. Since the 20th century, the country has become a heaven for people from all over the globe(全球).

The arrival of immigrants(移民) has shifted populations from rural(农村的) areas into cities because immigrants tend to settle in urban areas. At present, 81 percent of the inhabitants in the US live in cities.

Cultural and ethnic diversity adds a unique flavor to cities that is expressed through distinct(独特的) neighborhoods, restaurants, places of worship, museums, nightlife and multicultural learning environments.

Unique musical forms, such as jazz, rock and roll, Chicano music, and the blues, grow in the US by mixing a variety of culturally distinct musical traditions to create a new form.

At the executive (行政的) level, the country is headed by a mixed­race president; two posts(职位) on the Supreme Court are held by members of the country's two largest minorities.There is also diversity in state and local governments.

Without its rich mixture of races and cultures, America would not be the nation that it is today. Founded upon the basis of equality and freedom, America acts as a stage where different cultures not only co­exist peacefully, but develop well.

1.According to the passage, America is a country________.

A．that welcomes people from all over the world

B．where citizens take more pride in their original culture

C．that is mostly settled by Europeans and Africans

D．where 81% of the population are immigrants

2.Where did most people live before many immigrants came to America?

A．In the urban areas.                      B．In the rural areas.

C．In the southern part of America.            D．In the northern part of America.

3.We can learn from the sixth paragraph that________.

A．diversity(多样化) has existed in America in almost every aspect(方面)

B．most posts in American state governments are held by mixed­race people

C．equality and freedom make America a fair country

D．diversity has greatly affected the American political field

4.What's the best title for this passage?

A．The effects of culture and diversity on America.

B．The influence of globalization on America.

C．The political development of America.

D．The bright future of America.

5.We would most probably read this passage in a book about________.

A．science           B．history            C．culture           D．amusement