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【单选题】
距上颌壁最近的牙根为A.
上颌第一磨牙
B.
上颌第二磨牙
C.
上颌第三磨牙
D.
上颌第二前磨牙
E.
以上都是
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【单选题】Yet it was also the fastest and the most ___________ means of doing so.
A.
economic
B.
economy
C.
economical
D.
economically
【简答题】Green is an important color in nature . It is the color of grass and the leaves on trees . It is also the color of most growing plants . Sometimes , the word “ green ” means young , fresh and growing ...
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