填空题

For Questions 14 to 16, select one entry from the corresponding column of choices for each blank. Fill all blanks in the way that best completes the text.
The supply of fresh water continues to be a ______ for most environmentalists since, surprisingly, over 97 percent of the world’s water is un-potable because it comes from salty oceans.
  • A. digression
  • B. concern
  • C. catalyst
  • D. precept
  • E. compromise

【参考答案】

B
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The cost of books and materials accounted for approximately 30% of the school district’s annual expenditures. In 1990, what was the approximate average cost per student for books and materials
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B．$2,000
C．$3,000
D．$6,000
E．It cannot be determined from the given information.
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