如果结果不匹配，请 
更多“Shall（）text Dad”相关的问题
A.We have so many things for our picnic
B.Let’s go and ask your dad
C.Shall we have a picnic
Son： Mom, may I play my computer game for an hour or two？
Mom ：__________
A.Your teacher tells me that you should study harder.
B.I’ ve said before that the game takes too long.
C.Well, ah...You’re absolutely right to ask.
D.Sorry. Dad’s using the computer now.
Mary: We need some oranges.How many do we need to buy？
Xiaoyan: Four are enough.And we need some cream.
Mary: How much cream do we need to buy for four people？
Xiaoyan: Two cartons？ Shall we get a melon and some wine？ And 1 haven' t got any coffee.
Mary: OK.And lychees.Two tins？
Xiaoyan: How many lychees do you get in a tin？
Mary: 1 don' t know.Let' s get a big tin.We also need some mineral water.
Xiaoyan: And the prawns.How many prawns？
Mary: One big packet will do.I also need to get some vegetables for next week potatoes, carrots, onions, and a cabbage 1 think.There' s a little greengrocer's along the road.Why don't we go there first？
1、How many oranges does Xiaoyan want to buy？ ()
A.One.
B.A kilo.
C.Four.
2、Do they need any cream？ ()
A.Yes, they do.
B.No , they don't.
C.The text does not tell us
3、How many prawns do they want to buy？ ()
A.A packet.
B.Two packets.
C.Three packets.
4、Who would like to have some vegetables？ ()
A.Xiaoyan.
B.Mary
C.Shopkeeper.
5、Which is not included (包括) in the shopping list？ ()
A.Rice and peas.
B.Potatoes and coffee.
C.Melons and wine.
设f(x，y)与ψ(x，y)均为可微函数，且ψˊy(x，y)≠0，已知(xo，yo)是f(x，y)在约束条件ψ(x，y)＝0下的一个极值点，下列选项正确的是()
A．若fˊx(xo，yo)＝0则fˊy(xo，yo)＝0
B．若fˊx(xo，yo)＝0则fˊy(xo，yo)＝0
C．若fˊx(xo，yo)≠0则fˊy(xo，yo)≠0
D．若fˊx(xo，yo)≠0则fˊy(xo，yo)≠0
