摘要：下列句子均有一处错误(或多一词,或缺一词,或错一词).请找出并加以改正.1.This phenomenon may explain to why people spend time and money on trips.
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下列句子均有一处错误（或多一词；或缺一词；或错一词），请找出并加以改正。
A library with five thousand books are offered the nation as a gift.
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