计算：(5)2=______．(-5)2=______．

已知一次函数y=ax+b的图象过点（-2，1），则关于抛物线y=ax²-bx+3的三条叙述：①过定点（2，1），②对称轴可以是x=1，③a＜0时，其顶点纵坐标的最小值为3．其中正确的有______．（填序号）

第16～25小题，要求判断每题给出的条件(1)和(2)能否充分支持题干所陈述的结论．A、B、C、D、E五个选项为判断结果，请选择一项符合试题要求的判断．
A．条件(1)充分，但条件(2)不充分．
B．条件(2)充分，但条件(1)不充分．
C．条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
D．条件(1)充分，条件(2)也充分．
E．条件(1)和(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

圆C₁与C₂相切．
(1) C₁：x²+y²-4x-6y+9=0；C₂：x²+y²+12x+6y-19=0
(2) C₁：x²+y²-4x-6y-51=0；C₂：x²+y²+4x-5=0

某产品各零部件功能重要程度采用0—4评分法评分，结果见下表。在不修正各功能累积得分的前提下，零部件Ⅱ的功能重要性系数为（）。

A．0.025

B．0.125

C．0.225

D．0.4

Some people make you feel comfortable when they are around. You spend an hour with them and feel as if you have known them half your life. These people have something in common. And once we know what it is, we can try to do it ourselves.
How is it done Here are several skills that good talkers have. If you follow the skills, they’ll help you put people at their ease, and make friends with them quickly.
First of all, good talkers ask questions. Almost anyone, no matter how shy he is, will answer a question. One well-known businesswoman says, "At business lunches, I always ask people what they did that morning. It’s a common question, but it will get things going." From there you can move on to other matters—sometimes to really personal questions. And how he answers will let you know how far you can go.
Second, once good talkers have asked questions, they listen to the answers. This point seems clear, but it isn’t. Your questions should have a point and help to tell what sort of person you are talking to. And to find out, you really have to listen carefully and attentively.
Real listening at least means some things. First it means not to change the subject of conversation. If someone sticks to one topic, you can take it as a fact that he’s really interested in it. Real listening also means not just listening to words, but to tones of voice. If the voice sounds dull, then, it’s time for you to change the subject.
Finally, good talkers know well how to deal with the occasion of parting. If you’re saying goodbye, you may give him a firm handshake and say, "I’ve really enjoyed meeting you." If you want to see that person again, don’t keep it a secret. Let people know what you feel, and they may walk away feeling as if they’ve known you half their life.

After having asked somebody a question, it’ll be polite of you to ______.

A. make clear what kind of person he is
B. listen to his reply attentively
C. wait quietly and patiently for his answer
D. go on asking him more questions

患者，男，28岁。进行性腰痛、僵硬5年，X线平片示腰椎生理曲度变直，椎体呈方形，腰椎小关节间隙模糊变窄，双侧骶髂关节间隙变窄，关节面模糊。考虑为（）

A.脊椎转移

B.脊椎结核

C.化脓性脊椎炎

D.脊椎骨软骨炎

E.强直性脊椎炎