prep12中的一道题

crystal_10

It is the powerful compound capsaicin that makes a chili pepper hot; a single drop that has no taste and odor is capable of detection by humans at one part per million.

• A
  
  a single drop that has no taste and odor is capable of detection
  
  
  
• B
  
  a single drop is detectable, though without taste and odor,
  
  
  
• C
  
  a single tasteless and odorless drop can be detected
  
  
  
• D
  
  single tasteless and odorless drops are capable of detection
  
  
  
• E
  
  single drops that have no taste or odor can be detectable
  
  
  

请问 大家 BC的区别是什么？正确答案是C

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