单项选择题

When was the Fraunhofer Society founded

A．In 1940.
B．Last year.
C．After the unification,
D．In 1949.
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单项选择题
The word expertise in line 3 could be best replaced by
A．"experts".
B．"scientists".
C．"scholars".
D．"special knowledge".
单项选择题
Why does the author mention Egypt's mighty pyramid builders
A．Because they once worked miracles.
B．Because they were well-built.
C．Because they were actually very weak.
D．Because even they were unable to rescue their civilization.
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