题目内容

The drilling in Antarctica dragged on slowly because of lack of money, equipment breakdowns, environmental ______ and severe cold.

A. concerns B. assumption C. occupations D. ignorance

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相关题目

　　When people first began to drill for oil, their 1 were not scientific . They just 2 round the country and asked themselves, “ 3 shall we drill a well?” Sometimes they chose the 4 because they found oil on the 5 . ut they chose the place for no 6 reason . They took a 7 .

　　Drilling an oil well is 8 , and the work can be 9 . In the past there were often 10 . Sometimes the drilling suddenly 11 the rocks into an oil-trap. The great 12 inside the trap then caused an explosion (爆炸) . Oil and gas shot up the 13 and made great gushers (井喷) in the 14 . Sometimes there were great 15 , which people could see many 16 away.

　　Today drilling is very scientific. Scientists and engineers plan all the work. They plan the 17 of wells. They choose their positions in the 18 . They also advise and 19 the men who drill the wells how to work better. 20 , there are very few accidents today.

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