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雷雨交加的夜晚，小阳看到闪电后约5s听到雷声，他距雷电产生的地方大约多少米？（声音在空气中的传播速度约为340m/s）

答案

∵v=

s
t
，

∴s=vt=340m/s×5s=1700m．

答：小阳距雷电处的距离有1700m．

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Do you feel   1  difficult to be happy all the time? Now I’ll give you some tips   2  how to make yourself happy. One way is being unselfish because __3__ (self) is the key factor  4  (require) if you want to get along well with others. By   5  (say) being unselfish we mean we should not want everything our own way or demand the best share of everything.   6 way is to look for good points in other people. You’ll find most people pleasant to go with and it will surely make you happy. Third, you can not expect to be too perfect,  7 don’t be too unhappy when you make a mistake.  Everything will be OK if you try to make things right. Finally, it is important to remember while you are no  8_  (bad) than others, chances 9  you have may not be much better. In this case,  10_ surest way to be happy is to think yourself above other people.
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单项选择题

人们把在蚂蚁群中少数整日无所事事的蚂蚁，称作“懒蚂蚁”。但当断绝蚁群的食物来源时，那些平时工作很勤快的蚂蚁表现得一筹莫展，而“懒蚂蚁”们则“挺身而出”，带领众蚂蚁向它们早已侦察到的新食物源转移。这种“懒蚂蚁效应”对企业的启示是（）

①以市场为导向、研究和规划市场

②重视人才的培养，优化人才配置

③制定经营发展战略，强化管理工作

④加强技术研发，掌握核心技术

A、①②

B、①④

C、②③

D、③④
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