化学是研究物质的组成、结构、性质以及变化规律的科学。通过近一年的学习,你认识了很

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化学是研究物质的组成、结构、性质以及变化规律的科学。通过近一年的学习,你认识了很多物质,收获也一定不少!我们以水为专题:

(1)2007年3月22日是第十五届“世界水日”,主题是“应对水短缺”;3月22~28日是第二十届“中国水周”。请你为本届“中国水周”写一句宣传口号________________;你认为全球性水短缺主要原因有________________。

(2)一个水分子由___________构成;电解水实验证明水由__________元素组成;两个水分子用符号表示为_______________。

(3)矿泉水属于__________(填“纯净物”或“混合物”);请你列举一种检验硬水的方法________________;小李自制的简易净水器中加入了活性炭,是利用了活性炭的__________性质;蒙山母亲河“湄江”主要污染有__________;纯净水的pH=___________。

(4)要把100g20%的NaOH溶液稀释为10%,需加水__________g;“水火不相容”,请阐明水灭火的原理是___________________。

(5)水能与许多物质发生化学反应,请完成下列反应方程式:

A.______Na+______H2O==_______NaOH+_______H2(配平化学方程式)

B.生石灰与水的反应:____________________

C.二氧化碳与水的反应:____________________

D.二氧化硫与水的反应:_______________________

考点:关于溶液的计算水污染与防治硬水和软水节约用水水的组成化学反应方程式的书写
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超声仪纵向分辨力取决于()。

A.次声波

B.可听声波

C.超声波

D.空间脉冲长度

E.脉冲宽度

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干燥器出口有大颗粒可导致()。

A、干燥器BACKUP

B、旋风分离器高报

C、研磨机高报

D、返料风机停

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XI’AN---Seven people died in a fire early on Wednesday morning in Xi’an, capital of Shanxi Province. A restaurant with a karaoke hall in the southern suburbs caught fire around 2 a. m. and seven waitresses who were sleeping on the second floor of the restaurant were killed. The restaurant was completely destroyed and the waitresses, the local police said, were killed by toxic smoke from burning decorations.

MANILA---Four people were killed yesterday in the central Philippine island of Tacloban when a bomb they had dug up exploded, local police were quoted as saying. The four people were digging to set up a septic(poisonous)tank in their house when they dug up the bomb. It went off, killing all four people, local police were quoted by radio station DZBB as saying. The police did not say where the bomb came from. Unexploded bombs from World War II are still discovered around the Philippines once in a while.

TEL AVIV---An Israeli couple kissed for 30 hours and 45 minutes which, a spokeswoman said yesterday, was a world record. The couple, both in their twenties, started kissing on Monday at 8:30 p.m. along with 250 other couples in a contest. “For nearly 31 hours they didn’t eat, drink, talk or even go to the bathroom. And the whole time, they were standing up”, said Arielle Goldman, who handled public relations for the event. She said a representative of the Guinness Book of World Records was on hang to witness the event, recorded on video. The previous record was 29 hour and 37 minutes, Goldman said. The winning couple received two round-the-world plane tickets and $2,500. (277 words)

小题1:Which of the following statements is right?

A.The news report didn’t mention the loss caused by the fire.

B.After reading the report we know how the fire broke out.

C.The reporter tended to think the bomb had something to do with World War II

D.The police refused to admit the bomb had anything to do with World War II.小题2: The underlined word “toxic” means _____.

A.poisonous

B.dangerous

C.hot

D.thick小题3: The Israeli couple kissed for nearly 31 hours_____.

A.to test their endurance

B.to set a new world record

C.to show their special love

D.to prove they are very healthy小题4:Why did so many couples take part in the contest?

A.Because it was a good chance to enjoy themselves.

B.Because they were poor and wanted to gain the 2,500 dollars.

C.Because they wanted to attract people’s attention.

D.Because they aimed at the honor and prize.

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清热解毒,活血祛瘀止痛,治疗瘀阻疼痛宜选

A.板蓝根

B.秦皮

C.野菊花

D.红藤

E.败酱草

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CPU主要技术性能指标有

A.字长、运算速度和时钟主频

B.可靠性和精度

C.耗电量和效率

D.冷却效率

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