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举一反三
【单选题】对重度伸长牙的处理原则不正确的是
A.
为保存健康牙，应避免磨除健康牙体组织
B.
对修复治疗有妨碍时可调磨
C.
对下颌运动有妨碍时可调磨
D.
可拔除无对颌的第三磨牙
E.
严重者可行根管治疗后截冠修复
【单选题】The Scottish countryside will soon be home to creatures which is strange to Britain. This spring, 17 beavers (海狸) will be released into a remote area of rivers and forests. Hunted to extinction throug...
A.
Not all the people support setting loose wild animals in Britain
B.
Some small mammals will be out of control in Britain
C.
The landowners don"t like beavers because of the possible disasters
D.
British Parliament has proposed several times to bring beavers back
【单选题】河马排粪时利用将粪打散这种行为起到的作用是（）
A.
粪便成堆易于招致病原生物
B.
利用气味宣告自己的存在与位置
C.
使水将粪便冲走，易于饮水卫生
D.
防敌害免袭击