一静止的 核经 衰变成为 核，释放出的总动能为E_K，此衰变后核的动能为____．

《中国对外开放的新里程碑》：“如果说1971年中国恢复联合国合法席位，从此登上政治大舞台，那么，30年后……标志中国全面融入世界经济主流。”“标志中国全面融入世界经济主流”的事件是（    ）

锌铜原电池装置如图所示，其中阳离子交换膜只允许阳离子和水分子通过．下列有关叙述不正确的是（   ）

已知一次函数y＝kx＋b的图象如左图，那么正比例函数y＝kx和反比例函数y＝ $\frac{b}{x}$ 在同一坐标系中的图象大致是(      )

七选五

A. running away is anything B. they often find them in risky situations C. it may be natural D. these kids are more easy to get affected(感染) E. no one cares about them F. you probably imagine

    When you think about running away,  ____ that there will be no more rules, no parent to tell you what to do, no more fights. Sounds great and exciting, right? In fact,____ but fun. Kids who run away face new problems like not having any money, food to eat, a safe place to sleep, or anyone to take care of them.
    People with no home and no money become ready to do anything just to meet their everyday needs. Because of this,____ that would be terrible even for adults. Runaway kids join in dangerous crimes(犯罪) much more often than kids who live at home.
    Kids who live on the streets often have to steal(偷) for a living. Many take drugs to get through the day because they become so sad and feel that____. Some are forced(被迫) to do things they wouldn't normally do to make money. The number of kids with HIV or AIDS and other diseases is higher on streets, too, because  ____. This problem is attracting more and more attention.