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Tìm `x` biết `(77-x)/(33-x)=7/3`.
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C. READING I. Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks. (1.0 point) AIR POLLUTION Air pollution is a cause of ill-health in human beings. In a lot of countries, there are laws limiting amount of smoke which factories can produce. (26)........ there isn't enough information on the effects smoke in the atmosphere, doctors have proved that air pollution (27)..........lung diseases. The gases from the exhausts of car have also increased air pollution in most cities. The lead in petrol produces a (28)....... gas which often collects in busy streets surrounded by high buildings. Children (29)....... in areas where there is a lot of lead in the atmosphere cannot think as quickly as other children and are clumsy when they use their hands. There are other long-term effects of pollution. If the gases in the atmosphere continue to increase, the earth's climate may become warmer. A lot of the ice near the Pole may melt and may cause serious (30)....... Question 26: A. Because B. Although C. When D. So Question 27: A. causes B. leads C. makes D. gets Question 28: A. dead B. powerful C. power D. poisono Question 29: A. live B. living C. are living D. to live Question 30: A. flood B. storm C. earthquake D. typhoon

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