设A、B两车分别从甲、乙两地同时出发

在浓度为70%的酒精中加入10千克水，浓度变为35%，再加入若干千克纯酒精，浓度变为75%

Come on—Everybody's doing it

有三个不同的质数，已知它们的平方和为5070，则这三个质数的和为______．

三个小孩的年龄都是质数，他们岁数的和是18，则最小的小孩有

若直线y=x+b与曲线有公共点，则b的取值范围是______． A． B． C． D． E．

某人下午3:00出门赴约，若他每分钟走60 m，会迟到5min，若他每分钟走75m

甲、乙两仓库储存的粮食重量之比为4:3，乙、丙两仓库储存的粮食重量之比为5:6

A为一种油箱冷却剂，现散热箱中有4升浓度为20%的A溶液，汽车在行驶中，散热箱中水蒸发了2升

Many people see remarriage as a fresh new chance at happiness with a partner whom they should have chosen in the first place. But the statistics reveal that second or later marriages are much more likely to 1 divorce. Why is this so? For one thing, remarrying mates often have unrealistic 2 . They are in love, and they don't really understand that the 3 of a missing partner (due to divorce, desertion or death) doesn't actually 4 the family to its first-marriage status. 5 , remarriage will present them with a number of unanticipated design issues such as children's loyalty binds, the 6 of parenting tasks and the uniting of disparate family cultures. These are three of the five major structural challenges of remarriage outlined by psychologist Patricia Paper in her remarkable architectural model of remarriage. Essentially, the remarried family's unanticipated and difficult job is to 7 many of their old assumptions about how a "real family"—i. e., a traditional first-marriage family—is supposed to 8 and get to work on self-consciously planning, designing and building an entirely new kind of family structure that will 9 their own unique requirements. A second, and equally important problem for the new couple lies in the realm of 10 communication. This is especially true 11 matters which lie very close to the mates' hearts, such as the sensitive issue of the children's behavior. Are the members of the pair 12 and caring of each other's youngsters, who have 13 difficult losses and transitions? Or does a stepparent respond to a child's stark unfriendliness with outrage and attack? For example, it is much better for a stepmom say "I feel hurt when your daughters come to visit and don't even say Hello to me or make eye 14 "than "Whenever your bratty daughters come over, they walk right past me as if I didn't even exist! They are so rude, and you just 15 there!" The first response is an "I" message and could start a useful discussion about how to handle the problem, while the second "you" response is blaming and likely to 16 an argument. The knottiest of remarriage issues is often that of 17 , and here a ton of research provides a clear guideline. The stepparent's role should be similar to that of a nanny, an aunt or a baby-sitter who is familiar with the rules of the house (such as, no TV before homework is finished.) She or he em>monitors/em> and reports on the child's behavior, but ONLY the biological parent should do any kind of punishment (and is also allowed to let rules 18 .) And yet, far too often, a step-parent will think they should be the enforcer if they are to get real respect from their step-children. The problems of remarriage are a national issue that has been hiding under the 19 for far too long. It is only by bringing the unique challenges out into the open that we can possibly bring the 20 rate of these marriages down.

函数(x＞-3)的最小值为______． A．2 B． C．1 D． E．以上均不对

一袋中装有大小相同，编号分别为1，2，3，4，5，6，7，8的八个球，从中有放回地每次取一个球，共取2次，则取得两个球的编号和不小于15的概率为______． A． B． C． D． E．

代数式的最小值是 ． A．0 B． C．1 D．2 E．-1

从水平放置的球体容器顶部的一个孔向球内匀速注水，容器中水面的高度h与注水时间t之间的关系用图像表示应为______． A． B． C． D． E．以上结论均不正确

若圆(x-3)2+(y+5)2=r2上有且只有两个点到直线4x-3y-2=0的距离为1

马路上有编号为1，2，3，…，10的10只路灯，为节约用电，又不影响照明

已知方程x2-2x-m=0有两个不相同的正根，则m的取值范围是

设m，n是实数，且，则． A． B． C． D． E．以上都不对

有两种铁矿石，甲铁矿石含铁68%，乙铁矿石含铁63%，现要配制含铁65%的混合铁矿石100吨