D
Over 70 percent of the "double single-child couples" in China need help from their parents in taking care of their own kids, according to a recent survey．
"Women of China" magazine and a consulting company carried out a survey recently on young couples of the "single-child" generation, the Morning Post reports．The couples surveyed were around 29 and have been married for three years on average, with university education and monthly income of 4．000 yuan ($531)．Among them, 43．5 percent have kids．
Results show that 71．9 percent of the young couples have help from their parents in taking care of their kids．
Grown up as the "single-child", the only child in a family since the family planning policy was adopted in 1979, this generation depends much on their parents．
The parents of the "single-child" generation focused more on their children's physical well-being rather than their attitudes and values, according to some psychologists．
The research also found that the "double single-child couples" follow a rather traditional value system．
Survey shows that 27．5 percent of them got married after dating for one to two years, 25．2 percent two to five years, and 20 percent didn't tie the knot until dating for five years．Also, 30 percent of the couples were schoolmates, while 43．8 percent were introduced by someone．
Since their marriage are based on enduring relationships, 65．2 percent of the husbands and 62．9 percent of the wives think that compromise(妥协)and tolerance(宽容)are necessary in their marriage．Meanwhile, 21．7 percent of the husbands and 37．1 percent of the wives support the idea that happiness is the key standard for a marriage．
71．The best title for the passage should be_______．
A．Mom and Dad,Take Care of My Kid Please
B．Bouble Single-child Couples
C．The Problem of the Single Child
D．A Recent Survey By Woman of China"
72．Which of the following is NOT supported by the passage?
A．The majority of the "double single-child couples" in China depend much on their parents．
B．The parents of the “single-child”generation more care about their study and education．
C．One-fifth of the couples surveyed didn't get marriied until dating for five years．
D．All the couples surveyed have university education and 30 percent of them were schoolmates
73．Which of the following descriptions about “double single-child couples” is True ?
A．They are single child in either family and independent of their parents
B．They are single child in either family and they are dependent on their parents
C．They have at least two children and can afford to support themselves
D．They, who were introduced by someone, follow a rather traditional value system
74．The traditional value system mentioned in the passage refers that_____．
A．parents are concerned about their children’s physical life as well as the spiritual life
B．most couples were introduced by someone and made dating for a long time
C．once begun, double single-child couples’marriage will last forever
D．the couples think that compromise and tolerance are necessary in their marriage．
75．According to the passage, we can learn that ______ is necessary in marriage．
A．wealth        B．health        C．understanding D．education

D
Over 70 percent of the "double single-child couples" in China need help from their parents in taking care of their own kids, according to a recent survey．
"Women of China" magazine and a consulting company carried out a survey recently on young couples of the "single-child" generation, the Morning Post reports．The couples surveyed were around 29 and have been married for three years on average, with university education and monthly income of 4．000 yuan ($531)．Among them, 43．5 percent have kids．
Results show that 71．9 percent of the young couples have help from their parents in taking care of their kids．
Grown up as the "single-child", the only child in a family since the family planning policy was adopted in 1979, this generation depends much on their parents．
The parents of the "single-child" generation focused more on their children's physical well-being rather than their attitudes and values, according to some psychologists．
The research also found that the "double single-child couples" follow a rather traditional value system．
Survey shows that 27．5 percent of them got married after dating for one to two years, 25．2 percent two to five years, and 20 percent didn't tie the knot until dating for five years．Also, 30 percent of the couples were schoolmates, while 43．8 percent were introduced by someone．
Since their marriage are based on enduring relationships, 65．2 percent of the husbands and 62．9 percent of the wives think that compromise(妥协)and tolerance(宽容)are necessary in their marriage．Meanwhile, 21．7 percent of the husbands and 37．1 percent of the wives support the idea that happiness is the key standard for a marriage．
71．The best title for the passage should be_______．
A．Mom and Dad,Take Care of My Kid Please
B．Bouble Single-child Couples
C．The Problem of the Single Child
D．A Recent Survey By Woman of China"
72．Which of the following is NOT supported by the passage?
A．The majority of the "double single-child couples" in China depend much on their parents．
B．The parents of the “single-child”generation more care about their study and education．
C．One-fifth of the couples surveyed didn't get marriied until dating for five years．
D．All the couples surveyed have university education and 30 percent of them were schoolmates
73．Which of the following descriptions about “double single-child couples” is True ?
A．They are single child in either family and independent of their parents
B．They are single child in either family and they are dependent on their parents
C．They have at least two children and can afford to support themselves
D．They, who were introduced by someone, follow a rather traditional value system
74．The traditional value system mentioned in the passage refers that_____．
A．parents are concerned about their children’s physical life as well as the spiritual life
B．most couples were introduced by someone and made dating for a long time
C．once begun, double single-child couples’marriage will last forever
D．the couples think that compromise and tolerance are necessary in their marriage．
75．According to the passage, we can learn that ______ is necessary in marriage．
A．wealth        B．health        C．understanding D．education

如图所示，在等势面沿竖直方向的匀强电场中，一带负电的微粒以一定初速射人电场，并沿直线AB运动，由此可知

A电场中A点的电势低于B点的电势
B. 微粒在A点时的动能大于在B点时的动能，在A点时的电势能小于在B点时的电势能
C. 微粒在A点时的动能小于在B点时的动能，在A点时的电势能大于在B点时的电势能
D. 微粒在A点时的动能与电势能之和等于在B点时的动能与电势能之和

在化学反应MnO₂＋4HClMnCl₂＋2H₂O＋Cl₂↑中，四种元素的化合价在化学反应前后降低的是

A．Mn

B．O

C．H

D．Cl

在化学反应MnO₂＋4HClMnCl₂＋2H₂O＋Cl₂↑中，四种元素的化合价在化学反应前后降低的是

A．Mn

B．O

C．H

D．Cl

下列实验中（如图），观察不到明显变化的是 （   ）

下列实验中（如图），观察不到明显变化的是 （   ）

（16分）氢溴酸在医药和石化工业上有广泛用途。下图是模拟工业制备氢溴酸粗品并精制流程：

根据上述流程回答下列问题：
（1）混合①中发生反应的化学方程式为         。
（2）混合①中使用冰水的目的是              。
（3）操作Ⅱ和操作Ⅲ的名称分别是        、       。
操作Ⅲ一般适用于分离____________混合物。（选填编号）
a．固体和液体     b．固体和固体     c．互不相溶的液体   d．互溶的液体
（4）混合②中加入Na₂SO₃的目的是                               。
（5）纯净的氢溴酸应为无色液体，但实际工业生产中制得的氢溴酸（工业氢溴酸）带有淡淡的黄色。于是甲乙两同学设计了简单实验加以探究：
甲同学假设工业氢溴酸呈淡黄色是因为含Fe^3＋，则用于证明该假设所用的试剂为            ，若假设成立可观察到的现象为                 。
乙同学假设工业氢溴酸呈淡黄色是因为_______，其用于证明该假设所用的试剂为            。

若分式的值为0，则x的值为（   ）
A 2           B -2            C 2或-2            D 2或3

计算的结果是（      ）
A  1           B x+1            C            D