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单项选择题
By stupid endeavor ( Line 2, Para.1 ), Westhusin means to say that______.
A．human cloning is a foolish undertaking
B．animal cloning is absolutely impractical
C．human cloning should be done selectively
D．animal cloning is not worth the effort at all
单项选择题
By cloning Missy, Mark Westhusin hopes to______.
A．examine the reproductive system of the dog species
B．find out the differences between Missy and its clones
C．search for ways to modify its temperament
D．study the possibility of cloning humans
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