甲状舌管囊肿（）
A.囊肿位于根尖周围
B.囊肿可含有牙齿
C.囊肿位于鼻腭管内
D.囊肿位于颈部正中线上
E.囊肿常由导管阻塞引起
参考答案：D
△ABC中，①若AB=BC=CA，则△ABC是等边三角形；②一个底角为60°的等腰三角形是等边三角形；③顶角为60°的等腰三角形是等边三角形；④有两个角都是60°的三角形是等边三角形。上述结论中正确的有[ ]
A.1个
B.2个
C.3个
D.4个
The teacher asked the girl again, raising his voice a bit, but still _____ no answer.
A. receiving
B. received
C. receive
D. to receive
