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高血压病者服用降压药物治疗，降压目标是（）。

A.血压降至正常范围，即年轻者血压控制在120～130/80mmHg，老年人可降至140/90mmHg以内

B.降至临界高血压水平，即140～160/90～95mmHg

C.收缩压控制在160mmHg，舒张压控制在85mmHg

D.血压控制在患者可耐受的程度

E.以上都不是

（10＋6分）有一研究性学习小组在探究有关钢铁的腐蚀情况，他们进行了如下实验：在一个水槽中盛装1000 mL水，加入一定量的NaCl 固体溶解后通入SO₂气体至溶液pH值约为4左右，另取一支试管（带刻度，规格50mL），一条约5cm的细铁丝，将铁丝放入试管中，加入约  10mL前面配好的溶液，迅速用拇指扣住试管口倒扣于水槽中，用铁架台将试管固定，如右下图。过一会儿：

（1）观察到试管中的液面逐渐下降，这说明

在该条件下，铁丝发生了              腐蚀，

正极材料是      电极反应是                  

（2）再过一段时间发现液面停止下降，并且开始逐渐

上升，露在液面上的铁丝表面由原来的银白色变棕褐色，这说明在该条件下，铁丝发生了

           腐蚀，正极的电极反应为                                   

①总反应为：                                    ；①反应的产物极易被进一步氧化，生成红褐色物质，②该反应的化学方程式为：                                   若铁锈的组成为：Fe₂O₃·xH₂O ，试写出由②反应的产物在通常条件下生成铁锈的反应方程式：

③                                                                  

附加题（6分）（3）已知原来铁丝质量为2 g，发生（1）情况时，依液面下降的高度折为标准状况下的体积是5.6mL，则此时，铁丝的质量变为         g ，随后液面开始上升，即发生（2）的变化，依最终液面上升的高度折算为标准状况下的体积比最开始刚倒扣于水槽中试管中溶液的体积多了1.12mL，通过计算，（2）的过程共消耗氧气       mL，若x值为2，那么铁丝的质量应为           g（以上计算有效数字保留至小数点后三位）

固网交换设备故障处理应遵循（）的基本原则，业务恢复应遵循“先长途，后本地”的原则。

什么是幼儿常规？

阅读理解。

      Michael Phelps and his U.S. teammates crowned the greatest single Olympic performance on 17th

August, 2008 with a win in the 4?100 - meter medley relay.

     The victory gave Phelps his eighth gold medal of the Beijing Olympics, the most golds ever won by

an athlete at one Games. With gold No. 8, Phelps earned a singular place in the Olympic record books.

      "There is no comparison in the swimming world for what Michael has done," said Gregg Troy, coach

of U.S. swimmer Ryan Lochte, who finished third to Phelps in two races here in Beijing but also won

gold alongside him in the 4?200-meter freestyle relay. It's hard to find comparisons even in the sports

world overall. Phelps is solidly in the company of seemingly invincible superstars such as Michael Jordan

and Tiger Woods.

     "I think years and years down the road we'll realize more and more how amazing he is and how

special he really is." U. S. teammate Natalie Coughlin said. The 23-year-old from Baltimore capped a

brilliant meet at the Water Cube. He set a world record in every event aside from the 100 butterfly which

he narrowly won on Saturday, completing a program of 17 races in nine days.

     Phelps has won 14 Olympic gold medals and 16 total medals. He holds the record for most medals

won by a man, surpassing Soviet gymnast Nikolai Andrianov, who won 15 from 1972 -1980, Soviet

female gymnast Larysa Latynina holds the record with l8.

     At the 2004 Athens Games, Phelps won six gold medals and two bronze. He has already said he'll

swim in the 2012 London Games. Phelps' victories in Beijing include: 200-meter freestyle, 200 and 400

individual medleys, 100 and 200 butterfly, 4?200 free relay, 4?100 medley relay, and 4?100 free relay.

1. Which of the following would be the best title for the text?

A. Phelps wins 4?100 -meter medley relay        

B. Phelps writes Games gold history

C. Phelps plans to attend 2012 London Games      

D. Phelps finishes his competitions

2. Why are Michael Jordan and Tiger Woods mentioned in the 3rd paragraph?

A. To emphasize Phelps' unique position in swimming.

B. To indicate Phelps' great efforts to his championship.

C. To attract the world's attention to the young Phelps.

D. To memorize the two heroes' contributions to the world.

3. The world records Phelps has set do not include        .

A. 200-meter freestyle                      

B. 200 individual medleys

C. 200-meter butterfly                      

D. 100-meter butterfly

4. Which of the following is true of Phelps?

A. Phelps has won 18 Olympic gold medals till now.

B. Phelps has got the most gold medals in Beijing Olympic.

C. Phelps defeated Nikolai Andrianov in Beijing.

D. Phelps won 8 gold medals at the Athens Games.

5. It can be inferred from the text that        .

A. Phelps is a swimming genius by nature

B. Phelps succeeded in Athens at the age of 18

C. Phelps has won the most golds all by himself

D. Phelps will have a brilliant future in the 2012 London