即使是训练有素的足球守门员,面对射来的点球也常常扑空。你认为这是因为 。
球速太快,从发球点到入网所需时间,少于人作出反应的时间(即神经冲动在反射弧内传递的时间)
计算保守速动比率不需要的财务数据是()。
A.现金
B.存货
C.流动负债
D.短期债券
Mr. black isn't here. He _______ to the library. [ ]
A. has been to
B. has gone to
C. went to
D. goes to