《城市绿地分类标准》规定，游乐公园具有大型游乐设施，如单独设置时，其绿化应达到用地的

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       Most of us are worried about global warming(全球变暖).It is a very serious problem all over

the world. People began to keep the temperature records in 1850. 2009 was the fifth warmest year

since 1850.ln the May of 2009, India experienced a heat wave. In the June of 2009, north China also

experienced a heat wave. Warmer weather happens more often than before around the world. There

are natural reasons and human reasons for global warming. Most scientists believe that global warming

is mainly because of human activities. The use of fuel（燃料）is one of the human reasons. Cutting

down trees is another big reason.We should try to stop global warming. In order to do that, we should

plant more trees and try to use fewer cars.When we go out, we can take a bus or ride a bike. If there

are fewer cars, fuel use will be less. Everyone in the world should do their best to improve the

environment.

1. When did the keeping of temperature records begin?

2. Was 2009 the warmest year since people began to keep the temperature records?

3. Which country experienced a heat wave in the June of 2009?

4. What do most scientists think are the main reasons for global warming?

5. What should we do to stop global warming besides planting more trees?

下列由左到右的变形中属于因式分解的是（　　）

A．a（a+b-1）=a²+ab-a

B．m²-2m-3=m（m-2）-3

C．x²-2x=x（x-2）

D．m³+m²+m=m（m²+m）

女性，创伤性休克后入住ICU，护士进行抽血时，血不易抽出，易凝固，皮肤有出血点，紫斑。

急性DIC高凝期应及时应用（）。

A.凝血因子

B.止血药

C.肝素

D.阿司匹林

E.抗纤溶液

（2009·哈尔滨）某兴趣小组的同学们以“稀硫酸与氢氧化钠溶液能否发生反应”为课题进行了科学探究。   

同学们在烧杯中加入10mL稀硫酸。滴入几滴酚酞试液，接着分两次向烧杯中滴入氢氧化钠溶液。第一次滴加几滴氢氧化钠溶液后，不断搅拌，第二次继续滴加氢氧化钠溶液至过量。则第一次滴加氢氧化钠溶液时，溶液中溶质(不考虑酚酞)的质量变化情况是__________：第二次滴加氢氧化钠溶液时观察到的现象是_______________________。

由上述实验同学们得出了稀硫酸与氢氧化钠溶液能发生反应的结论。

[提出问题]是否可以用其他试剂证明稀硫酸与氢氧化钠溶液能发生反应呢?

[甲组实验]实验过程如图所示：

现象：向a试管中滴加氢氧化钠溶液时无明显现象，再滴加几滴硫酸铜溶液时出现蓝色沉淀。

结论：用硫酸铜溶液可以证明稀硫酸与氢氧化钠溶液能发生反应。

[乙组实验]实验过程如图所示：

现象：向b试管中滴加氢氧化钠溶液时无明显现象，再滴加几滴氯化钡溶液时出现白色沉淀。

结论：用氯化钡溶液可以证明稀硫酸与氢氧化钠溶液能发生反应。

[交流评价]请你评价甲、乙两组同学由实验现象获得的结论是否正确，并说明理由。

女，20岁，近1周发热，左小腿出现片状红斑，腹股沟淋巴结肿大疼痛，最可能的致病菌是（）

A.表皮葡萄球菌

B.铜绿假单胞菌

C.梭状芽孢杆菌

D.金黄色葡萄球菌

E.乙型溶血性链球菌