下列英语单词中,是中心对称的是[ ]
A.SOS
B.CEO
C.MBA
D.SAR
答案:A
— Most students went to the party yesterday. It is a pity that you were absent.
— I wish I ______. But I was terribly busy. [ ]
A. did
B. had
C. were
D. would
对联的上联是“橘子洲,舟旁洲,舟行洲不行”,下联“天心阁,阁中鸽,鸽飞阁不飞”。这形象地说明了运动和静止相互依存。静止是()
A.运动的衡量尺度
B.运动的内在原因
C.运动的普遍状态
D.运动的存在形式