单项选择题

A．also
B．besides
C．else
D．yet
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单项选择题
According to the passage, we do not know whether humans will benefit from taking in fewer calories partly because
A．humans, worms and rodents are different.
B．most people are not willing to be put on a strict diet.
C．the effect is not known.
D．genetic changes in tissues can not be performed on humans.
单项选择题
What does the last sentence in the third paragraph imply
A．People like to lose weight, but they do not like to eat less.
B．People want to go to heaven, but they do pot want to die.
C．Mice will go to heaven if they lose weight.
D．Mice enjoy losing weight.
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