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Read the following article and select the best answer. Article: Climatic conditions are delicately adjusted to composition of the Earth's atmosphere. If there were a change in the atmosphere -- for example, in the amounts of atmospheric gases -- the climate would probably change also. A slight increase in water vapor , for example, would increase the heat-keeping capacity of the atmosphere and would lead to a rise in global temperatures. The level of carbon dioxide, CO2, in the atmosphere has an important effect on climatic change. Most of the Earth's incoming energy is short-wavelength radiation , which tends to pass through atmospheric CO2easily. The Earth, however, reradiates much of the received energy as long-wavelength radiation , which CO2absorbs and then goes toward the Earth. This phenomenon, known as the greenhouse effect, can result in an increase in the surface temperature of a planet. An extreme example of the effect is shown by Venus, a planet covered by heavy clouds composed mostly of CO2, whose surface temperatures have been measured at 430~C.If the CO2 content of the atmosphere is reduced, the temperature falls. According to one respectable theory, if the atmospheric CO2concentration were halved, the Earth would become completely covered with ice. Another equally respectable theory, however, states that a halving of the CO2concentration would lead only to a reduction in global temperatures of 3degC. If, because of an increase in forest fires or volcanic activity, the CO2content of the atmosphere increased, a warmer climate would be produced. Plant growth, which relied on both the warmth and the availability of CO2, would probably increase. As a consequence, plant would use more and more CO2. Eventually CO2levels would decrease and the climate, in turn, would become cooler. With reduced temperatures many plants would die; CO2would thus be returned to the atmosphere and gradually the temperature would rise again. Thus, if this process occurred, there might be a long-term oscillation in the amount of CO2present in the atmosphere, with regular... Question: The author refers to Venus primarily in order to _ . - show that the greenhouse effect works on other planets but not on Earth - show the degree to which Earth's atmosphere differs from that of Venus - support the opinion that as water vapor increases, the amount of CO2increases - support the argument that the CO2level in the atmosphere has a significant effect on climate
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support the argument that the CO2level in the atmosphere has a significant effect on climate

(Q).
Read the following article and select the best answer. Article: There are a great number of people in the world while few people are great.I think there is probably only one great person out of 10,000 at best,and most probably much less than that. The reason why there are only few of them is that most people do not pay the price of greatness.There are so many people who want to be great,why only very few of them actually pay the price? The answer to the question explains the difference between the almost 100% people who want to be great and the much less than 0.01% who actually be so.The reason is that the road to greatness is full of pains. Greatness requires sacrifices and there is no sacrifice without pain.The kind of sacrifices required for greatness is the ones that make the process continuously painful for long time.If you only want to be good it may be painful just every now and then,and many people can still handle it.But being great is a total difference.The pain is much deeper and it is continuous,so very few people can endure this kind of pain.Most people naturally choose things that bring pleasures to them.It's unnatural to choose pain over pleasure,let alone doing it continuously for long time.But that's what I believe is the secret to greatness: The secret to greatness is choosing pain over pleasures continuously for long time. Question: If one person only wants to be good,what will he/she face? - Occasional pains. - Continual work. - Constant pains. - Various difficulties.
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Occasional pains.

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Read the following article and select the best answer. Article: Chinese officials yesterday urged employers to take more measures to protect workers against workplace diseases and injuries. Experts estimate that about 200 million workers face a potential danger of occupational diseases and work-related injuries. The majority of them are farmers-turned-workers who are working in small or medium-sized firms. One of the most serious workplace diseases on the Chinese mainland is pneumoconiosis, a lung disease that is caused by breathing in too much dust of coal, silicon, and cerement. It causes serious breathing difficulties and can be fatal . The disease killed 966 people in the country last year, according to an official report released by the Ministry of Health yesterday. From the early 1950s until the end of last year, 607,570 people were diagnosed with pneumoconiosis. Among the number, 137,481 people died from the disease. Chen Xiaohong, vice minister of health, said the general level of prevention and control of workplace diseases is still quite low in China. "Health authorities at various levels will do more education work in the future to raise employers' awareness that they are the first person responsible for any workplace diseases or accidents," Chen said. He made the remark at a ceremony held by his ministry and other relevant departments under the State Council to award prizes to 56 companies which have done well in protecting workers' health. On the Chinese mainland, more than 16 million companies are engaged in potentially dangerous sectors, such as coal mining, construction, and those that use chemicals, according to the Ministry of Health. Although many companies, especially large foreign-invested and State-owned ones, have done well in protecting workers' health, many employees are still working in dangerous places with poor protection and without any insurance support. At least 90 per cent of Chinese companies are small or medium-sized organizations. Many of these companies, especially private ones based in towns and villages, do not want to spend their... Question: From the passage, we can infer _ . - Chinese law on preventing occupational diseases has worked well. - the workers' awareness of protecting themselves has been greatly raised. - much remains to be done to protect the workers from workplace diseases. - the workers themselves are responsible for any workplace diseases or accidents.
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much remains to be done to protect the workers from workplace diseases.