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题目材料:

Which of the following is mentioned in the passage as a drawback of the immunological method of detecting peptide hormones?
  • AIt cannot be used to detect the presence of growth regulators in the brain.
  • BIt cannot distinguish between the peptide hormones and substances that are very similar to them.
  • CIt uses antiserums that are unable to cross the blood-brain barrier.
  • DIt involves a purification process that requires extensive training in endocrinology.
  • EIt involves injecting foreign substances directly into the bloodstream.

B显示答案

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