博山纹石产于山东博山，跟泰山石，大化石相类似。()
参考答案：错误
What was the possible reason for the shuttle disaster？
A. Columbia could not survive reentry.
B. A block of foam damaged a wing.
C. The aircraft disintegrated in the sky.
D. The external tank was made of reinforced carbon.
【C10】
As
B. Which
C. That
D. Who
【C14】
A. participants
B. candidates
C. rivals
D. victims
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