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  • A. many vaccines
  • B. prevent diseases
  • C. health education
  • D. healthy behavior
  • E. change unhealthy behavior
  • F. other health services

Immunization helps to ______.

【参考答案】

B
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C
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All the following qualities are mentioned in the passage EXCEPT ______.
A．interference-free pictures
B．a richer color
C．a wider screen
D．good reception of signals
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