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问题 填空题

如果|x-2|+y2-10y+25=0，则x+y=______．

答案

∵|x-2|+y2-10y+25=0，

∴|x-2|+（y-5）2=0，

x-2=0，

∴x=2，

y-5=0，

y=5，

∴x+y=2+5=7．

故答案为：7．

填空题

在学校秋季运动会中，小明的50m跑成绩是8.0s，他50m跑的平均速度是______m/s；在接力赛跑中，为保证交接棒顺利进行，交接棒时，两运动员要尽可能做到相对______．
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单项选择题

Teachers need to be aware of the emotional, intellectual, and physical changes that younga-duhs experience. And they also need to give serious (91) to how they can best (92) such changes. Growing bodies need movement and (93) , but not just in ways that emphasize competition. (94) they are adjusting to their new bodies and a whole host of new intellectual and emotional challenges, teenagers are especially self-conscious and need the (95) that comes from achieving success and knowing that their accomplishments are (96) by others. However, the typical teenage lifestyle is already filled with so much competition that it would be (97) to plan activities in which there are more winners than losers, (98) , publishing newsletters with many student-written book reviews, (99) student artwork, and sponsoring book discussion clubs. A variety of small clubs can provide (100) opportunities for leadership, as well as for practice in successful (101) dynamics. Making friends is extremely important to teenagers, and many shy students need the (102) of some kind of organization with a supportive adult (103) visible in the background.
In these activities, it is important to remember that young teens have (104) attention spans. A variety of activities should be organized (105) participants can remain active as long as they want and then go on to (106) else without feeling guilty and without letting the other participants (107) This does not mean that adults must accept irresponsibility. (108) , they can help students acquire a sense of commitment by (109) for roles that are within their (110) and their attention spans and by having clearly stated rules.

A．making

B．standing

C．planning

D．taking
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