下列命题:①若区间D内存在实数x使得f(x+1)>f(x),则y=f(x)在D上是增函数;②在定义域内是增函数;③函数图象关于原点对称;④既是奇函数又是偶函数的函数一定是="0" ; ⑤函数y=f(x+2)图象与函数y=f(2-x)图象关于直线x=2对称;其中正确命题的个数为:( )
I usually have ______ breakfast at home.I think it's good for my health.( )
A.aB.anC.theD./
It's nearly lunch time.How about having some noodles and dumplings?
.( )
A.You're welcomeB.That's right
C.That's nice of youD.That sounds good
As a middle school student,we should start thinking about _____ for our country in the future.( )
A.what we didB.what did we do
C.what we can doD.what can we do
What's the news about?
People near the lake didn't allow them to ______ a factory so as not to pollute the water.( )
A.look upB.put upC.take upD.set up
Keep working hard,Paul.You will surely realize your dream of being a writer you give it up halfway.
I will,thank you,Miss Rowling.( )
A.unlessB.ifC.sinceD.though