【单选题】听力原文: Sugar is so much a part of our modem life that we only really think about it when, for some reason, we cannot obtain it. It has been known to man for at least 3,000 years, but has come into comm...
【单选题】听力原文: Sugar is so much a part of our modern life that we only really think about it when, for some reason, we cannot obtain it. It has been known to man for at least 3,000 years, but has come into com...