全口牙中最小的牙是
A．上颌侧切牙
B．下颌侧切牙
C．上颌中切牙
D．下颌中切牙
E．下颌尖牙
参考答案：D
三项基本制度的内容包括：（）。
A、平衡合拢
B、交接验收
C、安全保密
D、勾挑核对
________it was ________so many elephants marching along the street.
A．How great fun; to see
B．What a great fun; seeing
C．What great fun; to see
D．How great a fun; to see.
