\(\sqrt{6+2\sqrt{3}+2\sqrt{2}+2\sqrt{6}}-\sqrt{5-2\sqrt{6}}=1+2\sqrt{2}\)

S=\(\dfrac{1}{a^2+a}\)\(+\dfrac{1}{a^2+3a+2}\)\(+\dfrac{1}{a^2+5a+6}\)\(+\dfrac{1}{a+3}\)

Khi nói về ánh sáng đơn sắc, phát biểu nào sau đây sai ?

A. Mỗi ánh sáng đơn sắc có một màu xác định gọi là màu đơn sắc

B. Mỗi ánh sáng đơn sắc có một bước sóng xác định trong chân không

C. Vận tốc truyền của một ánh sáng đơn sắc trong các môi trường trong suốt khác nhau là như nhau

D. Ánh sáng đơn sắc không bị tán sắc khi truyền qua lăng kính

Read the following passage and mark the letter A, B, C, or D on your answer sheet to choose the word or phrase that best fits each of the numbered blanks.

            In addition to the challenge to be excellent, American schools have been facing novel problems. They must ….(11) … with an influx of immigrant children, many of whom speak little or no English. They must respond to demands ….(12) ….the curriculum reflect the various cultures of all children. Schools must make sure that students develop …(13) … skills for the job market, and they must consider the needs of nontraditional students, such as teenage mothers.

            Schools are …(14)…. these problems in ways that reflect the diversity of theUSeducational system. They are hiring or training large numbers of teachers of English …(15)… a second language and, in some countries, setting up bilingual schools. They are opening …(16)… the traditional European-centered curriculum to embrace material from American, Asian, and other cultures.

            Schools are also teaching cognitive skills to the …(17)… 40 percent of American students who do not go on to higher education. In the …(18).. of a recent report by the Commission on Achieving Necessary Skills, “A strong back, the willingness to work, and a high  school diploma were once all that was necessary to …(19) ….

a start inAmerica. They are no longer. A well-developed mind, a continued willingness to learn and the ability to put knowledge to work are the new keys …(20) .. the future of our young people, the success of our business, and the economic well-being of the nation”.( Extracted from Info USA-CD Version).Question 16

A. on

B. into

C. for

D. up

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

VEGETARIANISM

Until recently, vegetarianism was fairly uncommon in Britain, and it is still considered strange by some. But since the 1960s its popularity has increased greatly, to the (1) ________ that high street stores stock a hugevariety of products for vegetarians. The reasons people give for not eating meat are numerous. Perhaps (2) _________ vegetarians do it for moral reasons, arguing that it is wrong to kill. The opposing point of view is that it is natural for us to kill for food, and that we have evolved to do so. Still, there are societies where eating meat is not allowed because it is (3) _________ their religion. There are other good reasons to give up meat, one of which is the inefficiency of livestock farming. A single field of soya bean plants can actually produce 200 times as much protein as the number of cattle which could be raised on the same area of land, so a vegetarian world might be a world without hunger. (4) ________ it is, in theory, cheaper to eat only vegetables, vegetarianism is most popular in richer countries such as Germany and Britain, where many people exclude meat for health reasons. In these countries, at least, it (5) ________ to be a matter of choice rather than necessity.

Điền ô số 5

A. finishes off 

B. goes through 

C. comes 

D. turns out 

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

Stars have been significant features in the design of many United States coins and their number has varied from one to forty-eight stars. Most of the coins issued from about 1799 to the early years of the twentieth century bore thirteen stars representing the thirteen original colonies. Curiously enough, the first American silver coins, issued in 1794, had fifteen stars because by that time Vermont and Kentucky has joined the Union. At that time it was apparently the intention of mint officials to add a star for each new state. Following the admission of Tennessee

in 1796, for example, some varieties of half dimes, dimes, and half-dollars were produced with sixteen starts. As more states were admitted to the Union, however, it quickly became apparent that this scheme would not prove practical and the coins from A798 on were issued with only thirteen stars-one for each ofthe original colonies. Due to an error at the mint, one variety of the A828 half cent was issued with only twelve stars. There is also a variety of the large cent with only A2 stars, but this is the result of a die breakand is not a true error.

What is the main topic of the passage?

A. Stars on American coins

B. The teaching of astronomy in state universities

C. The star as national symbol of the United States

D. Colonial stamps and coins.