今后的能源发展必须实行:()
A.可持续发展节能战略
B.可持续发展洁净煤奇数战略
C.可持续发展新能源战略
D.可再生能源战略
参考答案:A, B, C, D
造成牙周病患牙齿松动的原因中不包括()
A.牙周韧带炎症
B.创伤
C.牙槽骨吸收
D.夜磨牙
E.根纵裂
Father asked Anne_______________________.
A.when did she go to bed
B.when she went to bed
C.when she go to bed
D.when does she go to bed