抛物线y=x2+2x+4的图象可以看作是将y=x的图象经过（ ）平移得到的。
向左平移1个单位，再向上平移3个单位
The girl arranged to have piano lessons at the training centre with her sister _____ she would stay for
an hour.
A. where
B. who
C. which
D. what
发现后牙牙合面呈杯状磨耗，提示可能有
A．内倾型深覆牙合
B．深覆盖
C．紧咬牙
D．磨牙症
E．不良咬合习惯
