单项选择题

A．To learn how to prevent a bone disease.
B．To understand differences between bone tissue and other tissue.
C．To find out how specialized bone cells have evolved.
D．To create artificial bone tissue.
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单项选择题
By stupid endeavor ( Line 2, Para. 1 ) , Westhusin means to say that ________.
A．animal cloning is not worth the effort at all
B．animal cloning is absolutely impractical
C．human cloning should be done selectively
D．human cloning is a foolish undertaking
单项选择题
The space agencies are reluctant to open up space to tourists.
A．Y
B．N
C．NG
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