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(妥協(xié))and tolerance(寬容)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(妥協(xié))and tolerance(寬容)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

如圖所示，在等勢(shì)面沿豎直方向的勻強(qiáng)電場(chǎng)中，一帶負(fù)電的微粒以一定初速射人電場(chǎng)，并沿直線AB運(yùn)動(dòng)，由此可知

A電場(chǎng)中A點(diǎn)的電勢(shì)低于B點(diǎn)的電勢(shì)
B. 微粒在A點(diǎn)時(shí)的動(dòng)能大于在B點(diǎn)時(shí)的動(dòng)能，在A點(diǎn)時(shí)的電勢(shì)能小于在B點(diǎn)時(shí)的電勢(shì)能
C. 微粒在A點(diǎn)時(shí)的動(dòng)能小于在B點(diǎn)時(shí)的動(dòng)能，在A點(diǎn)時(shí)的電勢(shì)能大于在B點(diǎn)時(shí)的電勢(shì)能
D. 微粒在A點(diǎn)時(shí)的動(dòng)能與電勢(shì)能之和等于在B點(diǎn)時(shí)的動(dòng)能與電勢(shì)能之和

在化學(xué)反應(yīng)MnO₂＋4HClMnCl₂＋2H₂O＋Cl₂↑中，四種元素的化合價(jià)在化學(xué)反應(yīng)前后降低的是

A．Mn

B．O

C．H

D．Cl

在化學(xué)反應(yīng)MnO₂＋4HClMnCl₂＋2H₂O＋Cl₂↑中，四種元素的化合價(jià)在化學(xué)反應(yīng)前后降低的是

A．Mn

B．O

C．H

D．Cl

下列實(shí)驗(yàn)中（如圖），觀察不到明顯變化的是 （   ）

下列實(shí)驗(yàn)中（如圖），觀察不到明顯變化的是 （   ）

（16分）氫溴酸在醫(yī)藥和石化工業(yè)上有廣泛用途。下圖是模擬工業(yè)制備氫溴酸粗品并精制流程：

根據(jù)上述流程回答下列問(wèn)題：
（1）混合①中發(fā)生反應(yīng)的化學(xué)方程式為         。
（2）混合①中使用冰水的目的是              。
（3）操作Ⅱ和操作Ⅲ的名稱分別是        、       。
操作Ⅲ一般適用于分離____________混合物。（選填編號(hào)）
a．固體和液體     b．固體和固體     c．互不相溶的液體   d．互溶的液體
（4）混合②中加入Na₂SO₃的目的是                               。
（5）純凈的氫溴酸應(yīng)為無(wú)色液體，但實(shí)際工業(yè)生產(chǎn)中制得的氫溴酸（工業(yè)氫溴酸）帶有淡淡的黃色。于是甲乙兩同學(xué)設(shè)計(jì)了簡(jiǎn)單實(shí)驗(yàn)加以探究：
甲同學(xué)假設(shè)工業(yè)氫溴酸呈淡黃色是因?yàn)楹現(xiàn)e^3＋，則用于證明該假設(shè)所用的試劑為            ，若假設(shè)成立可觀察到的現(xiàn)象為                 。
乙同學(xué)假設(shè)工業(yè)氫溴酸呈淡黃色是因?yàn)開(kāi)______，其用于證明該假設(shè)所用的試劑為            。

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

計(jì)算的結(jié)果是（      ）
A  1           B x+1            C            D