燃料电池的突出优点是把化学能直接转变为电能，而不经过热能中间形式，现已广泛使用．

背景资料

某机电安装公司承担北方某城市三台蒸发量25t/h，蒸发压力为2.5MPa的散装工业锅炉的安装工程。开工前，项目经理部未办理任何手续即根据施工组织设计进行了全面的质量策划，并指令专业工程师编制质量控制程序。在施工过程中发现某焊工的合格证已过有效期，在进行分项工程质量验收时发生下列事件：事件1，锅炉本体已安装完毕，但钢骨架因施工过程保护不够造成局部垂直度超差。事件2，与锅炉本体连接的主干管上，发现有一段管道的壁厚比设计要求小1mm，该段管道质量证明书和验收手续齐全，除壁厚外，其他项目均满足设计要求。经了解是由于当时工期比较紧，原规格管道数量不足而采用此管。事件3，工程在采暖期到来前按期完工，但因建设单位配套设施尚不具备条件，没能进行系统试运。当气温骤降后，残留的水没有排净，造成部分设备冻裂。

锅炉安装工程开工前，施工单位应办理什么手续？

The bell rang and every student had to_________their examination papers．

A．give up

B．give away

C．give out

D．give in

理论上，SO₂能发生类似CO₂与澄清石灰水作用的反应，但在通常实验中，将SO₂通入澄清石灰水却没有看到类似CO₂那样先浑浊后澄清的现象．针对这一问题，研究性学习小组开展了探究性实验．

I．用图A所示的装置来分别做CO₂、SO₂与澄清石灰水的反应实验，结果通入CO₂可看到先浑浊后澄清的现象，但通入SO₂没看到浑浊现象．

Ⅱ．用图B的装置，将气体收集在注射器里，缓慢地将气体一个气泡一个气泡地通入澄清石灰水中，无论CO₂还是SO₂都能看到“先变浑再澄清”的现象．当以相同速率分别通入CO₂或SO₂，通入SO₂产生现象明显比通入CO₂产生现象快．

回答下列问题：

（1）通过上述I、Ⅱ实验，可以确定，将足量SO₂缓慢通入澄清石灰水，依次发生的反应有：（用离子方程式表示）______；______．

（2）实验I中，通入SO₂不能出现浑浊的原因可能是：______．

（3）实验Ⅱ中，同速率分别通入CO₂或SO₂，SO₂产生现象比CO₂快的相关因素有______．

①SO₂在水中溶解度比CO₂大．

②相同状态下，SO₂的密度比CO₂的密度大．

③亚硫酸酸性比碳酸强，在同温度、同体积的溶液中，l mol亚硫酸电离产生的H⁺离子浓度大于l mol碳酸电离产生的H⁺离子浓度．

④SO₂有毒和刺激性气味，CO₂无毒和无刺激性气味．

⑤相同条件下，1mol SO₂与足量石灰水反应生成CaSO₃的速率大于1mol CO₂与足量石灰水反应生成CaCO₃的速率．

⑥相同条件下，1molCaSO₃被1mol SO₂（形成的H⁺离子）溶解形成可溶性Ca（HSO₃）₂的速率大于1molCaCO₃被1molCO₂（形成的H⁺离子）溶解形成可溶性Ca（HCO₃）₂的速率．

阅读理解

     Boys need friends, suffer when they don't believe they have any, and worry over the ups and downs

of relationships. Many adults believe that somehow boys need friends less than girls do, in truth, though,

no boy is an island; boys value their friends throughout childhood and adolescence and are happier and

healthier when they have solid relationships with peers(同龄人).

     Despite the common belief that girls are better at relationships, most boys consider their friends a very

important part of their lives, and boys may actually be better at keeping friendships than girls are. A

recent study of 10 to 15yearold boys and girls found that girls' friendships are actually more fragile. Girls

tend to say and do hurtful things to each other more frequently than boys, and girls are more hurt by the

end of a friendship.

     Boys are the living definition of the phrase "peer group"； they love games with rules, competition,

and doing things together. Boys seem to enjoy, even need the opportunity to test themselves against

others, and many lasting friendships begin in karate(空手道) class or on the basketball court.

Competence and skill are widely respected; being picked last for a team or left out altogether is an

experience that can haunt(萦绕心头) a boy for years.

     As boys mature, the friendship becomes even more important, and it frequently widens to include

girls. During the teen years, friends can become the most important part of a boy's life-and a part in

which his parents are not included. The confusion of being a teenager leads boys to form close bonds

with friends. There is the sense for many boys that a friend is someone who is "always there for me",  

someone he can trust. They may be partners in crime or partners in study, but the friendship of

adolescent boys can run surprisingly deep.

1. The common belief of adults is that boys________.

A. don't care about others as much as girls

B. don't value friendship as much as girls

C. have the same friendship as girls

D. have healthier friendship than girls

2. According to the text, boys' friendship________.

A. is usually built around active play

B. tends to be in small groups

C. can bear mutual hurt between friends

D. doesn't suffer from failure

3. The author mentions the study in the second paragraph to prove ________.

A. many people believe girls are better at relationships

B. most boys consider their friends very important

C. boys may be better at keeping friendships than girls

D. boys may be more active in a friendship

4. As a boy gets older, he tends to________.

A. widen his circle of friends to include different kinds of people

B. shift his focus from his friends to himself

C. leave his parents out of his friendship

D. be confused about what a friendship is

5. What's the best title for the text?

A. Friendships between Boys and Girls

B. Boys and Their Friendship

C. Childhood and Adolescent Friendship

D. Tips on Making Friends with Boys

甲乙就承包的责任田的边界问题发生争执，甲还将乙种植于争议地段的玉米抢摘走。两人所在地的人民政府就甲乙之间的争议作出裁决，认为争议地段的承包权归乙，甲须于10日以内将所抢玉米返还乙。甲对乡政府这一裁决不服，欲通过诉讼的方式解决与乙的争议。请问：甲能否就与乙的争议提起民事诉讼原因何在()

A．可以。因民事诉讼即是解决平等民事主体之间民事争议的

B．不可以。本案中甲应遵循先行政后民事的原则，先提起行政诉讼

C．可以。因为民事诉讼法没有类似于行政诉讼法“受案范围”的限制，几乎所有的民事争议均可以通过民事诉论解决

D．不可以。乡政府的裁决行为一经送达甲和乙，即发生了法律效力，甲只能承提裁决行为的法律后果，不得再有异议