下列几种生物中,具有细胞结构的是( )
A:①②③
B:①②④
C:①③④
D:②③④
—Tom, why did you make no reply when I called your name in the street just now?—Sorry, Jim. I to my wife on the phone.
(25−23×35)÷1317 =( )
完全位于北半球的两个大洲是____ 和____ 。