命门穴旁开3寸为（）
A.腰阳关
B.关元俞
C.肾俞
D.秩边
E.志室
参考答案：E
Time goes by so fast. We must never miss the chance to show
love for our parents and make them _____ how much they mean to us.[ ]
A. to know
B. knowing
C. know
由于技术和安全的原因，不推荐直接从轮船的船舱采样（）
