问题：
[单选题] What can he inferred about completely normally fed mice mentioned in the passage?
A They will not experience free radical production．B They will experience more genetic rejuvenation in their lifetime．C They have more old liver ...问题：
[单选题] According to the author，which of the following most interested the researchers?
A The mice that started dieting in old age．B 27 of those 46 0ld genes that continued to behave like young genes．C Calorie restriction that works i...问题：
[单选题] The earthquake that hit the eastern half of the United States two centuries ago is the biggest“mid—
A rightB wrongC not mention问题：
[单选题] Schmidt and her colleagues are the first group of scientists studying Europa．
A RightB WrongC Not mention问题：
[单选题] It can be inferred from Paragraph 5 that DNA fingerprinting _________．
A is costly to the policeB could be a social issueC 1s the only way to prove innocenceD has been a profitable business问题：
[单选题] Only a small minority of the mentally ill are liable to harm themselves or others,
A easyB possibleC likelyD difficult问题：
[单选题] Techniques to employ the energy of the sun are being developed.
A convertB storeC utilizeD receive问题：
[单选题] The study suggests that it is more difficult to respond what to get rid of.
A RightB WrongC Not mentioned问题：
