单项选择题

When used in criminal investigation, DNA fingerprinting requires ______.

A．some blood of the suspect
B．prints of the suspect's fingers
C．hairs or blood found at the scene of the crime
D．both A and C
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单项选择题
The passage argues for potatoes because it ______.
A．contains little fat
B．has more vitamin C than most vegetables
C．gives you a full stomach feeling
D．all the above
单项选择题
The author wants to convey the idea in the last paragraph that ______.
A．the flavor of chicken gravy added to potatoes can provide better taste
B．the potato has its own specific role to play
C．potatoes may be made use of in many ways
D．no one can make potatoes taste like chicken
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