工业增加值是指工业行业在报告期内以货币表现的工业生产活动的最终成果，是衡量国民经济的重要统计指标之一。()
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What is the best title for the text？
A. Don't Turn Off Your Biological Clock.
B. Day Working is Better Than Night Working.
C. Night Workers: Be Careful.
D. What is Bad of Night Working.
听力原文：M: How much will it cost to send this letter to Beijing？
W: It weights half an ounce. That'll be six dollars by airmail.
Which of the following is right？
A. The man wants to send a letter to Shanghai．
B. The woman is a seller．
C. The two speakers are at the post office．
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