问答题

若一次函数y=x+5的图象经过点P(a,b)和Q(c,d),则ad+bc-ac-bd的值是( ).
(A)9
(B)16
(C)25
(D)-25

A.
(A)9
(B)16

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单项选择题

听力原文：W: Daddy, I have decided to give up science and go to business school.
M: Well, it is your choice as long as you pay your own way, but I should ware you that not everyone with a business degree will make a successful manager.
Q: What do we learn from the conversation?
(2)
A．The man doesn't have money for his daughter's graduate studies.
B．The man doesn't think his daughter will get a business degree.
C．The man insists that his daughter should pursue her studies in science.
D．The man advises his daughter to think carefully before making her decision.

A.
M:
B.
Q:
C.The
D.
B．The
E.
C．The
F.
D．The
G.

设☉O的半径是5,点P不在☉O外,若点O与P的距离|OP|=m2－2m＋2,则m的取值范围是( ). (A)m <－1或m

设☉O的半径是5,点P不在☉O外,若点O与P的距离|OP|=m2-2m+2,则m的取值范围是( ).
(A)m <-1或m >3.
(B)-1 ≤m ≤3.
(C)m ≤-1.
(D)m ≥3.