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
According to the passage, it can be concluded that _________.
A．electronic publishing will eventually take the place of traditional journals
B．the process of scholarship will change greatly in a world of electric networks
C．electronic publishing is becoming the predominant means of scholarly communication
D．scholarly skywriting will be the most important skill for most scientists
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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