边关的又称回臂拳，练习时须注意，转体跟步要一致，肘臂伸直，肩关节要（），力击点在拳背。
参考答案：灵活
Compared with his sister, Jerry is even more________to, and more easily troubled by, emotional and
relationship problems. [ ]
A. sceptical
B. addicted
C. available
D. sensitive
与颅内海绵窦相交通的是（）
A.脐周静脉网
B.食管静脉丛
C.直肠静脉丛
D.翼静脉丛
E.椎静脉丛
