【简答题】关于下列命题: ①若函数y=2 x 的定义域是{x|x≤0},则它的值域是{y|y≤1}; ②若函数y= 1 x 的定义域是{x|x>2},则它的值域是{y|y≤ 1 2 }; ③若函数y=x 2 的值域是{y|0≤y≤4},则它的定义域一定是{x|-2≤x≤2}; ④若函数y=log 2 x的值域是{y|y≤3},则它的定义域是{x|0<x≤8}. 其中不正确的命题的序号是 ______.(注:...
【判断题】露西是目前发现的最早的能够直立行走的人。()
【单选题】Speaker A: Please give my best wishes to your parents. Speaker B: __________
A.
Thank you all the same.
C.
My parents are very healthy.
【单选题】一只母羊在2014年11月3日配种,该羊的产羔日期为( )。
【单选题】To tell the truth, ________is my b elief that parents shouldn't give children whatever they want. [ ]
【单选题】Please give my best wishes ______ your parents. [ ]
【单选题】Remember to give your parents my regards when you _____home.
【单选题】My parents give ____ a nice toy for my birthday.
【简答题】I wrote to my parents to ask for some money, because my money began to . A.give away B.give in C.give off D.give out
【简答题】若函数y=f(x)的定义域是[-2,3],则函数 y= f(2x-1) x-1 的定义域为______.