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.

Are organically grown foods the best food choices? The advantages claimed for such foods over conventionally grown and marketed food products are now being debated. Advocates of organic foods – a term whose meaning varies greatly – frequently proclaim that such products are safer and more nutritious than others.

The growing interest of consumers in the safety and more nutritional quality of the typical North American diet is a welcome development. However, much of this interest has been sparked by sweeping claims that the food supply is unsafe or inadequate in meeting nutritional needs. Although most of these claims are not supported by scientific evidence, the preponderance of written material advancing such claims makes it difficult for the general public to separate fact from fiction. As a result, claims that eating a diet consisting entirely of organically grown foods prevents or cures disease or provides other benefits to health have become widely publicized and form the basis for folklore.

Almost daily the public is besieged by claims for “no-aging” diets, new vitamins, and other wonder foods. There are numerous unsubstantiated reports that natural vitamins are superior to synthetic ones, that fertilized eggs are nutritionally superior to unfertilized eggs, that untreated grains are better than fumigated grains and the like.

One thing that most organically grown food products seem to have in common is that they cost more than conventionally grown foods. But in many cases consumers are misled if they believe organic foods can maintain health and provide better nutritional quality than conventionally grown foods. So there is real cause for concern if consumers, particularly those with limited incomes, distrust the regular food and buy only expensive organic foods instead.

According to the last paragraph, consumers who believe that organic foods are better than conventionally grown foods are often _______.

A. careless

B. mistaken

C. thrifty

D. wealthy

Hãy cho biết những chất nào sau đây có khi hiđro hóa cho cùng sản phẩm?

A. but-1-en, buta-1,3-đien, vinyl axetilen

B. propen, propin, isobutilen.

C. etyl benzen, p-xilen, stiren

D. etilen, axetilen và propanđien.

Tổng số chất hữu cơ mạch hở, có cùng công thức phân tử C₂H₄O₂ là

A. 3

B. 1

C. 2

D. 4

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 43 to 50.

“The economic history of the United States”, one scholar has written, “is the history of the rise and development of the capitalistic system”. The colonists of the eighteenth century pushed forward what those of the seventeenth century have begun: the expansion and elaboration of an economy born in the great age of capitalist expansion.

Our excellent natural resources paved the way for the development of abundant capital to increase our growth. Capital includes the tools – such as: machines, vehicles, and buildings – that makes the outputs of labor and resources more valuable. But it also includes the funds necessary to buy those tools. If a society had to consume everything it produced just to stay alive, nothing could be put aside to increase future productions. But if a farmer can grow more corn than his family needs to eat, he can use the surplus as seed to increase the next crop, or to feed workers who build tractors. This process of capital accumulation was aided in the American economy by our cultural heritage. Saving played an important role in the European tradition. It contributed to American’s motivation to put something aside today for the tools to buy tomorrow.

The great bulk of the accumulated wealth of America, as distinguished from what was consumed, was derived either directly or indirectly from trade. Though some manufacturing existed, its role in the accumulation of capital was negligible. A merchant class of opulent proportions was already visible in the seaboard cities, its wealth as the obvious consequence of shrewd and resourceful management of the carrying trade. Even the rich planters of tidewater Virginia and the rice coast of South Carolina finally depended for their genteel way of life upon the ships and merchants who sold their tobacco and rice in the markets of Europe. As colonial production rose and trade expanded, a business community emerged in the colonies, linking the provinces by lines of trade and identity of interest.

The phrase “paved the way” in the second paragraph is closest in meaning to ______.

A. paid for

B. supported         

C. accumulated     

D. resembled

Cho tam giác DEF cân tại D với đường trung tuyến DI.

 Chứng minh ΔDEI = ΔDFI.