有关标准姿势的叙述,错误的是
A.人体直立
B.掌心向前
C.两眼向前方平视
D.双上肢下垂置躯干两侧
E.两下肢并拢,足尖外展
参考答案:B
解析:应是掌心靠体侧。
But I went to bed too late the evening before, so I didn’t get up until 7:00.Because I went to bed too late the evening before, I ______ ______ getting up at 6:00.
若x+y+57=y-z+17=x-z+44=0,则x2+y2+z2=______.