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【参考答案】

O
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A．Who the early settlers were.B．When the first Arbor Day began.C．How the first Arbor Day came into being.D．Who wasJ. Sterling Morton.
A．Who the early settlers were.
B．When the first Arbor Day began.
C．How the first Arbor Day came into being.
D．Who wasJ. Sterling Morton.
填空题
C
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