____ It's 7 o'clock. It's time to get up.
____ No, it isn't. It's sunny today.
____ Hurry up! You have to go to school now.
____ Mum, what time is it?
____ Is it cold today?
伴随着生理发育,我们的心理也会不断发生变化,出现矛盾和困惑,导致我们出现矛盾心理的变化有( )
①自我意识不断增强 ②认知能力得到发展
③情感世界愈加丰富 ④说话声音发生变化
利用一次函数的图象解二元一次方程组: 2x+3y=53x-y=2.
你认为贫血的人体内有可能缺乏的无机盐是( )