球上颌囊肿多位于上颌（）的牙根之间
A.中切牙与侧切牙
B.侧切牙与尖牙
C.左右中切牙
D.尖牙与前磨牙
E.以上都不是
参考答案：B
Every year lots of trees to make our country more beautiful.
A. is planted B. are planted C. plant
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