单项选择题

According to the passage, the soft part of fossilized animals______.

A．can always be accurately identified
B．have usually left some traces
C．can usually be reconstructed
D．have always vanished without any trace
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单项选择题
The Great Crash in the passage refers to______.
A．the end of World War Ⅰ
B．the Great Depression
C．high unemployment figures
D．a slump in the stock market
单项选择题
The best title for the passage is______
A．The Twenties
B．The Great Crash
C．The Depression
D．The End of World War Ⅰ
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