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318-Petroleum products vary so much in physical appearance because . .
A)impurities change the nature of the substance so much
B)there is a great' demand for them in different forms
C)their chemical composition is made up of countless elements -
***D)carbon and hydrogen atoms can join in thousands of different ways
E)trace elements have a remarkable effect on hydrocarbons

There is an advantage to launching satellites from the equator. The Earth spins faster there, giving rockets a boost in reaching orbit that allows them to carry heavier payloads. But there are few suitable launching sites on the equator that would not involve political problems. Therefore, an international consortium has converted an oil-drilling platform into a floating launch pad, rocket assembly plant, and mission control. They hope to develop the capacity to launch commercial telecommunications satellites.

319-The main advantage of launching satellites from the equator is that . .
***A)it is easier to put larger satellites into orbit from there
B)it does not cause political problems in the countries concerned
C)there are a number of oil-drilling platforms available in the area
D)the weather is more reliable there
E)life is cheaper for the mission control and rocket assembly staff

320-The passage states that an international consortium .. .
***A)is planning to launch satellites from the equator
B)has had problems as to the use of the oil-drilling platform in the equator
C)is negotiating with the equatorial countries for a launching pad
D)is ignoring the political problems having arisen in the area
E)is temporarily launching satellites from an oil-drilling platform

321-Considering the circumstances stated in the passage, the oil-drilling platform mentioned must be, .
A)cheap to convert into a floating launch pad
B)positioned at the best point in the ocean
C)unable to launch rockets with heavier payloads
***D)in international waters, where it does not cause political problems
E)away from any of the equatorial countries

In 776 B.C., the first Olympic Games were held at the foot of Mount Olympus to honour the Greeks' chief god, Zeus. The ancient Greeks emphasised physical fitness and strength in the education of youth. Therefore, contests in running. Jumping, discus and javelin throwing. Boxing, and horse and chariot racing were held in individual cities, and the winners competed every four years at Mount Olympus. Winners were honoured by having olive wreaths placed on their heads and having poems sung about their deeds. Originally these were held as games of friendship, and any wars in progress were halted to allow the games to take place.