Coi dao động điện từ của một mạch dao động LC là dao động tự do. Biết độ tự cảm của cuộn dây là L = 2 . 10 - 2 H và điện dung của tụ điện là C = 2 . 10 - 10 F . Chu kì dao động điện từ tự do trong mạch dao động này là

A .   2 πs

B .   4 π . 10 - 6 s

C .   2 π . 10 - 6 s

D .   4 πs

Read the followingpassage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer for each of the question.

The economic depression in the late-nineteenth-century United States contributed significantly to a growing movement in literature toward realism and naturalism. After the 1870' s, a number of important authors began to reject the romanticism that had prevailed Line immediately following the Civil War of 1861-1865 and turned instead to realism.

Determined to portray life as it was, with fldelity to real life and accurate representation without idealization, they studied local dialects, wrote stories which focused on life in speciflc regions of the country, and emphasized the "true" relationships between people. In doing so, they reflected broader trends in the society, such as industrialization, evolutionary theory which emphasized the effect of the environment on humans, and the influence of science.

Realists such as Joel Chandler Harris and Ellen Glasgow depicted life in the South; Hamlin Garland described life on the Great Plains; and Sarah One Jewett wrote about everyday life in rural New England. Another realist, Bret Harte, achieved fame with stories that portrayed local life in the California mining camps.

Samuel Clemens, who adopted the pen name Mark Twain, became the country's most outstanding realist author, observing life around him with a humorous and skeptical eye. In his stories and novels, Twain drew on his own experiences and used dialect and common speech instead of literary language, touching off a major change in American prose style.

Other writers became impatient even with realism. Pushing evolutionary theory to its limits, they wrote of a world in which a cruel and merciless environment determined human fate. These writers, called naturalists, often focused on economic hardship, studying people struggling with poverty, and other aspects of urban and industrial life.

Naturalists brought to their writing a passion for direct and honest experience. Theodore Dreiser, the foremost naturalist writer, in novels such as Sister Carrie, grimly portrayed a dark world in which human beings were tossed about by forces beyond their understanding or control. Dreiser thought that writers should tell the truth about human affairs, not fabricate romance, and Sister Carrie, he said, was "not intended as a piece of literary craftsmanship, but was a picture of conditions."

The word "foremost" in line 24 is closest in meaning to 

A. most difficult

B. interesting 

C. most focused 

D. leading

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks. Fill in the appropriate word in question 36

          What’s your dream? Touring castles in Scotland? Walking on the Great Wall of China? Working to improve the lives of women in rural Uganda? If you’re thinking of studying (30)___________, there’s no end to the places you can go, things you can see, and subjects you can study. At many top schools, such as Duke, Tufts, or Brown, over a third of the junior class take the opportunity to complete part of their (31)___________outside of the United States. Even if your school doesn’t have an extensive study abroad program, you can often get credit from a different school.

          Multiple benefits accrue to those who spend significant (32)___________in another country, and a significant proportion of students see the experience as an important (33)___________of their college years. You’re likely to have fun. But if you’re also thinking about study abroad as a way to gain a critical career advantage, read on. You’ll find that all foreign experiences are not created equal in the minds of employers.

          Employers are looking for graduates who can (34)___________well with others, both in person and in writing. They know the (35)___________of cross-cultural understanding and an appreciation for different points of view. They gravitate toward students who demonstrate maturity, initiative, and (36)___________. All of these assets can be demonstrated through study abroad, but it’s going to be much (37)___________to set yourself apart if you’ve taken the easy route.

          It’s not hard to find the “easy route”: that’s the one where you go with your friends to another country; all the arrangements are made for you by the school—including the American-style apartment where you live with your classmates. In this scenario, it doesn’t (38)___________which country you go to because all your classes will be in English, and possibly even taught by your American professors. You’ll undoubtedly have a somewhat different experience, but to do the “easy route” is to forego some of the major (39)___________of your time away

A. creating

B. creation 

C. creativity

D. creative

Read the following passage on transport, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42.

    Reading to oneself is a modern activity which was almost unknown to the scholars of the classical and medieval worlds, while during the fifteenth century the term “reading” undoubtedly meant reading aloud. Only during the nineteenth century did silent reading become commonplace.

    One should be wary, however, of assuming that silent reading came about simply because reading aloud was a distraction to others. Examinations of factors related to the historical development of silent reading have revealed that it became the usual mode of reading for most adults mainly because the tasks themselves changed in character.

    The last century saw a steady gradual increase in literacy and thus in the number of readers. As the number of readers increased, the number of potential listeners declined and thus there was some reduction in the need to read aloud. As reading for the benefit of listeners grew less common, so came the flourishing of reading as a private activity in such public places as libraries, railway carriages and offices, where reading aloud would cause distraction to other readers.

    Towards the end of the century, there was still considerable argument over whether books should be used for information or treated respectfully and over whether the reading of materials such as newspapers was in some way mentally weakening. Indeed, this argument remains with us still in education. However, whatever its virtues, the old shared literacy culture had gone and was replaced by the printed mass media on the one hand and by books and periodicals for a specialised readership on the other.

    By the end of the twentieth century, students were being recommended to adopt attitudes to books and to use reading skills which were inappropriate, if not impossible, for the oral reader. The social, cultural and technological changes in the century had greatly altered what the term “reading” implied.

Silent reading, especially in public places, flourished mainly because of ___.

A. the decreasing need to read aloud

B. the development of libraries

C. the increase in literacy

D. the decreasing number of listeners

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

She sent her children to the park so that she could have some _____________ .

A. fresh and quiet

B. quiet and peace

C. peace and quiet

D. fresh and peace

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

I want to tell you about my _____________ when I first arrived in London.

A. incidents

B. happenings

C. experiences

D. events