有关上颌第一恒磨牙髓室形态特征中哪个是正确的()
A.龈径最大
B.近远中径大于颊舌径
C.近远中径最小
D.颊舌径大于近远中径
E.龈径大于颊舌径
参考答案:D
—Does she like singing English songs?
—Yes. She _______ to sing English songs in her room.
A.often does B.is often heard C.often hears
怎样引导学生积极主动地参与学习?