——When is Day?——It's on June 1st, Dave.
A:Child
B:Children
C:Child's
D:Children's
已知向量a→=(x,2),b→=(﹣2,﹣x),若两向量方向相反,则x=( )
He ______ have breakfast. ( )
在人体内含量最多,约占体重的60%﹣70%的营养物质是( )
看图,选择与句意相符的图片。 A. B. C. D. E.