填空题

What’s the purpose of citing the examples of Pittsburgh in the first paragraph

【参考答案】

Proving ’that the young should start at the beginning.
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A．The conversion of volcanic waste to fertilizer.B．The menace of currently dormant volcanoes around Mount Saint Helens.C．The eruption of Mount Saint Helens and its effects on the environment.D．The elimination of volcanic ash by natural means.
A．The conversion of volcanic waste to fertilizer.
B．The menace of currently dormant volcanoes around Mount Saint Helens.
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D．The elimination of volcanic ash by natural means.
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A．Kings and queens, princes and princesses, and lords and ladies built castles in order to get more land.B．Around the outside of a castle, a moat was dug, which was often filled with water.C．A castle was built behind a thick and high stonewall, which was strong enough to stand the possible attack of enemies.D．If a drawbridge was pulled up, there was no way for people to enter the castle.
A．Kings and queens, princes and princesses, and lords and ladies built castles in order to get more land.
B．Around the outside of a castle, a moat was dug, which was often filled with water.
C．A castle was built behind a thick and high stonewall, which was strong enough to stand the possible attack of enemies.
D．If a drawbridge was pulled up, there was no way for people to enter the castle.
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