填空题

  • A. No evidence to indicate bad effects of naturally contaminated soil
  • B. Potential hazards of human contaminated soils
  • C. Research on channels of heavy metals getting into human food chain
  • D. Geology and health problems
  • E. Rocks-the ultimate source of soil pollution
  • F. Long-term health effects on children

Paragraph 1 ______.

【参考答案】

D
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Some serious diseases are connected with deficiency of ______.
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More cell phones are sold than PDAs.
A．Right
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