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【单选题】
据说早在五六千年前，中国就有了茶树（tea-shru）。A.
People said that China had tea-shrubs as early as five to six thousand years ago.
B.
It is believed that China had tea-shrubs as early as five to six thousand years ago.
C.
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D.
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【简答题】影响有色配合物的摩尔吸光系数ε的因素是_________。
【简答题】请用本周学过的单词填空。 Coal is actually cheaper than______.
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