Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 23 to 27. Fill in the appropriate word in question 25

  Without transportation, our modem society could not (23) _____________. We would have no metal, no coal and no oil nor would we have any (24 _____________ made from these materials. (25) _____________, we would have to spend most of our time raising food and food would be limited to the kinds that could grow in the climate and soil of our neighborhood.

  Transportation also affects our lives in other ways. Transportation can speed a doctor to the side of a sick person, even if the patients’ lives on an isolated farm. It can take police to the scene of a crime within a moment of being noticed. Transportation (26)____________teams of athletes to compete in national and international sports contests. In time of (27) _____________transportation can rush aid to persons in areas stricken by floods, families and earthquakes.

A. Even

B. Besides 

C. Although

D. However

Cho các chất và tính chất sau:

Hãy ghép cặp chất với tính chất phù hợp:

A. (1)-d, (2)-a, (3)-b, (4)-c.

B. (1)-c, (2)-a, (3)-b, (4)-d.

C. (1)-c, (2)-b, (3)-a, (4)-c.

D. (1)-c, (2)-d, (3)-b, (4)-a

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 from 35 to 42.

Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds - any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They compete for sunlight, nutrients, and water with useful plants.

The global need for weed control had been answered mainly by the chemical industry. Its herbicides are effective and sometimes necessary, but some pose serious problems, particularly if misused. Toxic compounds threaten animal and public health when they accumulate in food plants, groundwater, and drinking water. They also harm workers who apply them.

In recent years, the chemical industry has introduced several herbicides that are more ecologically sound. Yet new chemicals alone cannot solve the world's weed problems. Hence, scientists are exploring the innate weed-killing powers of living organisms, primarily insects and microorganisms.

The biological agents now in use are environmentally benign and are harmless to humans. They can be chosen for their ability to attack selected targets and leave crops and other plants untouched. In contrast, some of the most effective chemicals kill virtually all the plants they come in contact with, sparing only those that are naturally resistant or have been genetically modified for resistance. Furthermore, a number of biological agents can be administered only once, after which no added applications are needed. Chemicals typically must be used several times per growing season.

According to the passage, biological agents mainly consist of ____________. 

A. herbicides 

B. useful plants 

C. weeds     

D. insects and microorganisms 

Tính giá trị của biểu thức x2y3 + xy tại x = 1 và y = 1/2.

Khi xà phòng hóa triolein trong dung dịch NaOH ta thu được sản phẩm là

A. C₁₅H₃₁COONa và etanol

B. C₁₇H₃₅COOH và glixerol

C. C₁₅H₃₁COONa và glixerol

D. C₁₇H₃₃COONa và glixerol

\(\sqrt{\left(\sqrt{3}+1\right)^2}-\sqrt{\left(\sqrt{3}-1\right)^2}=\sqrt{3}+1-\sqrt{3}+1=2\)

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