Section I Vocabulary
　　Directions: There are 20 incomplete sentences in this section. For each sentence there are four choices marked A, B, C and D. Choose the one that best completes the sentence and mark your answers on ANSWER SHEET 1. (10 points)
　　1. Oil is an important ______material which can be processed into many different products, including plastics.
　　A raw B bleak C flexible D fertile
　　2. The high living standards of the US cause its present population to ____ 25 percent of the wo ...