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【简答题】
已知函数①y=x 2 +1，②y=-2x 2 +x．函数______（填序号）有最小值，当x=______时，该函数的最小值是______．
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举一反三
【单选题】—________ you ever ________ the Great Wall? —Yes, twice. [ ]
A.
Have; been
B.
Have; been to
C.
Have; gone to
D.
Have; been in
【单选题】Have you ever been in such a situation _____ you are very embarrassed and don't know what to say? [ ]
A.
which
B.
where
C.
when
D.
that
【简答题】我国最早发行国际信用卡的银行是：（）
【单选题】- Have you ever been to Tokyo? --__________.
A.
No , 1 didn't go there last year
B.
No , but 1 hope to go there next year
C.
Yes , I'll do it next time
【单选题】—_______ you ever _______ to Beijing? —No, I _______. [ ]
A.
Have; been; haven't
B.
Have; gone; hasn't
C.
Have; been; hasn't
D.
Have; gone; haven't
【简答题】—Have you ever been to Shanghai? —______. A) Not yet B) Haven't C) Yet not D) Still not
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