酶具有高催化效率的因素有：（）、（）、（）和（）。

如图所示，A、B、C为电场中同一电场线上的三点.设电荷在电场中只受电场力作用，则下列说法中正确的是

A.若在C点无初速地释放正电荷，则正电荷向B运动，电势能减少

B.若在C点无初速地释放正电荷，则正电荷向A运动，电势能增加

C.若在C点无初速地释放负电荷，则负电荷向A运动，电势能增加

D.若在C点无初速地释放负电荷，则负电荷向B运动, 电势能减少

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 good-bye, 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.

小题1:Asking questions might be a quite good and suitable way _______.

A．for you to make more and more new friends

B．to begin your business talks

C．to get the conversation going smoothly

D．for you to make a deep and lasting impression on others小题2: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小题3:Generally speaking, good talkers are persons who _______.

A．are good at making any topic interesting

B．never talk too much or too little

C．always speak in a gentle way

D．know how and when they should change the topic of the talk小题4:If you really take delight in meeting someone again, _______.

A．you may take him as your lifelong trustworthy friend

B．it seems necessary for you to let him know it

C．it’s proper for you to give him a second handshake

D．it’ll be helpful for you to have further understanding of him

如图所示，光滑水平地面上固定一带光滑滑轮的竖直杆，用轻绳系着小滑块绕过滑轮．现用恒力F_l水平向左拉滑块的同时，用恒力F₂拉右侧绳端，使滑块沿水平面从A点起由静止开始向右运动，经过B后至C点．若AB=BC，下列说法不正确的是（  ）

A．从A点至B点F₂做的功小于从B点至C点F₂做的功

B．从A点至B点F₂做的功大于从B点至C点F₂做的功

C．从A点至C点F₂做的功可能等于滑块克服F₁做的功

D．从A点至C点F₂做的功可能大于滑块克服F_l做的功

现有建筑物应予保留的条件是：现状房地产的价值（）新建房地产的价值减去拆除现有建筑物的费用及建造新建筑物的费用之后的余额。

A.小于

B.大于

C.等于

D.小于或等于

40岁妇女，近2个月性交后白带中带血。

确诊本患者的辅助检查手段应是（）。

A.宫颈碘试验及 * * 镜检查

B. * * 镜指导下宫颈多点活组织检查

C.高危型HPV-DNA检测

D.宫颈刮片细胞学检查

E.分段刮宫活组织检查