试管内壁残留下列物质，用稀盐酸浸泡不能除去的是（ ） A．铁制品的锈渍 B．氢氧

“细菌冶金”是利用某些细菌的特殊代谢功能开采金属矿石，例如溶液中氧化亚铁硫杆菌能利用空气中的氧气将黄铁矿（主要成分FeS₂）氧化为Fe₂(SO₄)₃，并使溶液酸性增强，其过程如图：

（1）该过程的化学反应方程式为             。

（2）人们可利用Fe₂(SO₄)₃作强氧化剂溶解铜矿石（Cu₂S），然后加入铁屑进一步得到铜，该过程中发生的离子反应方程式（请将①补充完整）：

①□Cu₂S＋□Fe^3＋＋□H₂O□Cu^2＋＋□Fe^2＋＋□（   ）＋□SO₄^2－

②                                    。

（3）工业上可利用粗铜（含Zn、Ag、Au杂质）经电解制得精铜（电解铜）。则阳极和阴极材料

分别为：       和       ，阳极的电极反应式为          ，          。

（4）请评价细菌冶金的优点                               。（说一点即可）

中国半殖民半封建社会形成的原因主要是（）

A、中国人民的反抗

B、外国资本主义势力入侵

C、中国封建主义势力压迫

D、制度和技术的落后

阅读理解。

      A new study suggests that the roundtheclock(24小时的)availability that cell phones

have brought to people's lives may be taking_a_toll_on family life.The study,which followed

more than 1,300 adults over 2 years, found that those who consistently used a mobile phone

throughout the study period were more likely to report negative "spillover" between work and

home life-and,in turn,less satisfaction with their family life.

     Spillover essentially(本质上)means that the line between work and home begins to become

unclear.Work life may invade home life when a parent is taking jobrelated calls at home,for

instance-or family issues may start to take up work time.For example,a child may call mum at

work,telling her "microwave exploded",explained Noelle Chesley,an assistant professor of

sociology at the University of WisconsinMilwaukee and the author of the study. The problem

with cell phones seems to be that they are allowing for even more spillover between work and

home.

      This may be especially true for working women,the study found. Among men,consistent use

of mobile phones seemed to allow more work issues to creep (潜入)into family time.But for

women,the spillover tended to go in both directions. Being "connected" meant that work cut into

home time,and family issues came into work life.

       Cell phones seem to be opening more lines for stressful exchanges among family members.

But there may be ways to control the spillover,according to Chesley.Employers, she said,could

look at their policies on contacting employees after hours to make sure their expectations are

"reasonable"．For their part,employees could decide that cell phones go off during family time,

Chesley said.

1．What does the underlined phrase "taking a toll on" probably mean in Paragraph 1

A．Explaining.  

B．Founding.

C. Damaging.  

D．Extending

2．According to Chesley,what is the best solution to the problem caused by cell phones?

A．Refuse to use cell phones.

B. Separate work hours from family time.

C. Ignore coming calls during family time.

D. Encourage women to stay at home.

3．We can learn from the passage that ________.

A．cell phones make the line between work and home unclear

B．cell phones seem to be convenient to families

C．cell phones affect men as much as women

D．we can do nothing to solve the problem

4．What is the main idea of the passage?

A．How to control the negative spillover caused by cell phones.

B. Cell phones cause negative "spillover" between work life and home life.

C. Consistent use of cell phones makes people feel less satisfied with their work.

D. How work life invades home life.

进出口化妆品的经营者或其代理人应在报检前( )个工作日向国家质检总局指定的检验机构提出标签审核申请。

A．30
B．60
C．90
D．120

近日，国内一则“媳妇怀孕，男子要求邻居停用wifi”的新闻成为热点。wifi是一种无线联网技术，广泛用于我们日常生活中，作为一个无线设备，它有一个发射机，其产生的辐射属于以下哪种辐射？（）

A.激光辐射

B.电离辐射

C.电磁辐射

D.热辐射