A:①
B:②
C:③
D:④
_________ Henry's mother ________ his father speaks English. They both speak Chinese.
万有引力定律和力学三定律,被认为是“人类智慧史上最伟大的一个成就”。取得这一成就的是( )
按四舍五入法取近似值:40.674 9≈____(精确到十分位).