单项选择题

According to the author, three design types of previous researches are ______.

A．interrelated to one another
B．supplementary to one another
C．to be modified considerably
D．to be integrated into one design
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单项选择题
In the first paragraph, the author draws an analogy between ______.
A．doing research and drawing a picture
B．research finding and picture's perspective
C．designing a research and making a quick drawing
D．a researcher and a painter
单项选择题
Why the team believed that the four-foot mammoth tusk was the most important find
A．Because it was the longest tusk ever found.
B．Because there were signs left by human's tools on it.
C．Because there were grooves on it.
D．Because there are not any mammoth tusk all over the world.
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