Có bao nhiêu số nguyên a < 5 biết: 10 là bội của (2a + 5)

A. 4

B. 5

C. 8

D. 6

Kim loại nào sau đây dùng làm sạch dung dịch đồng nitrat có lẫn bạc nitrat:

A. Fe

B. K

C. Cu

D. Ag

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

Until recently, most American entrepreneurs were men. Discrimination against women in business, the demand of caring for families, and lack of business training had kept the number of women entrepreneurs small. Now, however, businesses owned by women account for more than $40 billion in annual revenues, and this figure is likely to continue rising throughout the 1990s. As Carolyn Doppelt Gray, an official of the Small Business Administration, has noted, “The 1970s were the decade of women entering management, and the 1980s turned out to be the decade of woman entrepreneur”. What are some of the factors behind this trend? For one thing, as more women earn advanced degrees in business and enter the corporate world, they are finding obstacles. Women are still excluded from most executive suites. Charlotte Taylor, a management consultant, had noted, “In the 1970s women believed if they got an MBA and worked hard they could become chairman of the board. Now they’ve found out that isn’t going to happen so they go out on their own”.

In the past, most women entrepreneurs worked in “women’s” field: cosmetic and clothing, for example. But this is changing. Consider ASK computer system, a $22- million-a-year computer software business. It was founded in 1973 by Sandra Kurtzig, who was then a housewife with degrees in math and engineering. When Kurtzig founded the business, her first product was software that let weekly newspaper keep tabs on their newspaper carriers-and her office was a bedroom at home, with a shoebox under the bed to hold the company’s cash. After she succeeded with the newspaper software system, she hired several bright computer-science graduates to develop additional programs. When these were marketed and sold, ASK began to grow. It now has 200 employees, and Sandra Kurtzig owns $66.9 million of stock.

Of course, many women who start their own businesses fail, just as men often do. They still face hurdles in the business world, especially problems in raising money; the banking and finance world is still dominated by men, and old attitudes die hard. Most businesses owned by women are still quite small. But the situation is changing; there are likely to be many more Sandra Kurtzings in the years ahead.

All of the following were mentioned in the passage as detriments to women in the business world EXCEPT _________.

A. women were required to stay at home with their family

B. women lacked ability to work in business

C. women faced discrimination in business

D. women were not trained in business

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 26 to 34.

Although noise, commonly defined as unwanted sound, is a widely recognized form of pollution, it is very difficult to measure because the discomfort experienced by different individuals is highly subjective and, therefore, variable. Exposure to lower levels of noise may be slightly irritating, whereas exposure to higher levels may actually cause hearing loss. Particularly in congested urban areas, the noise produced as a by-product of our advancing technology causes physical and psychological harm, and detracts from the quality of life for those who are exposed to it.

Unlike the eyes, which can be covered by the eyelids against strong light, the ear has no lid, and is, therefore, always open and vulnerable; noise penetrates without protection.

Noise causes effects that the hearer cannot control and to which the body never becomes accustomed. Loud noises instinctively signal danger to any organism with a hearing mechanism, including human beings. In response, heartbeat and respiration accelerate, blood vessels constrict, the skin pales, and muscles tense. In fact, there is a general increase in functioning brought about by the flow of adrenaline released in response to fear, and some of these responses persist even longer than the noise, occasionally as long as thirty minutes after the sound has ceased.

Because noise is unavoidable in a complex, industrial society, we are constantly responding in the same way that we would respond to danger. Recently, researchers have concluded that noise and our response may be much more than an annoyance. It may be a serious threat to physical and psychological health and well-being, causing damage not only to the ear and brain but also to the heart and stomach. We have long known that hearing loss is America's number one nonfatal health problem, but now we are learning that some of us with heart disease and ulcers may be victims of noise as well. Fetuses exposed to noise tend to be overactive, they cry easily, and they are more sensitive to gastrointestinal problems after birth. In addition, the psychic effect of noise is very important. Nervousness, irritability, tension, and anxiety increase affecting the quality of rest during sleep, and the efficiency of activities during waking hours, as well as the way that we interact with each other

Question:Why is noise difficult to measure?

A. All people do not respond to it in the same way.

B. It causes hearing loss.

C. It is unwanted.

D. People become accustomed to it.

Read the following passage, and mark the letter (A, B, c or D) on your answer sheet to indicate the correct answer for each of the blanks

GLOBAL WARMING

Few people now question the reality of global wanning and its effects on the world ‘s climate. Mary scientists (46)_________the blame for recent natural disasters on the increase in the world ‘s temperatures and are convinced that, more than (47)_________before, the Earth is at risk from the forces of the wind, rain and sun. (48)_________to them, global warming is making extreme weather events, such as hurricanes and droughts, even more (49)_________and causing sea levels all around the world to (50)_________.

Emrironmental groups are putting (51)_________on governments to take action to reduce the amount of carbon dioxide which is given (52)_________by factories and power plants, thus attracking the problem at its source. They are in (53)_________of more money being spent on research into solar, wind and wave energy devices, which could then replace existing power (54)_________.

Some scientists, (55)_________, believe that even if we stopped releasing carbon dioxide and other gases into the atmosphere tomorrow, we would have to wait several hundred years to notice the result. Global I warming, it seems, is to stay.

Question 48

A. Concerning

B. Regarding

C. Depending

D. According