下列变化中属于物理变化的是（ ） A．蛋白质遇浓硝酸呈黄色 B．冰雪融化 C．三

文后的四个句子依次填入横线处，恰当的顺序是 （　　            ）。 （4分）

   ，你尽可流动明眸，欣赏白云蓝天，飞流激湍；    ，你尽可闭目凝神，倾听莺歌燕舞，春水潺潺；    ，你尽可翕动鼻翼，呼吸牡丹的浓香，黄菊的清爽；   ，你尽可品评自娱，把玩深尝。

①文学是一座姹紫嫣红的百花园      ②文学是一杯回味无穷的香茶

③文学是一幅意境高远的中国画      ④文学是一首清脆圆润的古曲

（8分）利用图所示的实验器材,测定额定电压为6V的小灯泡电功率。已知滑动变阻器上标有“12Ω 1A”字样，电源电压保持不变。实验步骤如下：

（1）．连接电路。在甲图上补画一根导线，使得测定小灯泡电功率的电路完整，要求滑片P向右移动时，小灯泡变暗。

（2）．连好电路后，要使滑动变阻器的电阻全部接入电路，应先将滑片P移至      （填“左”或“右”）端，再闭合开关S，此时电压表示数为4.2V，对应的电流表示数如图乙所示。

（3）．调节滑片，当P移至中点时，小灯泡恰好正常发光。

（4）．继续调节滑片，当P移至另一点时，灯泡偏亮，读出电压表、电流表值分别为6.5V、0.52A，记录在下表中。

请你填全上表空格中的数据，再分析表格中的信息，得到的结论是(写出两条即可)：

①：                                                           ；

②：                                                           。

急性有机磷中毒可表现为三大症状，即__________、__________和_____________。

阅读理解

     Living in a green area can make you live longer, according to the research published today. The

research also shows that the difference in life expectancy (平均寿命) between rich and poor becomes

smaller among those who live in an environment with parks and trees.

     Richard Mitchell, from Glasgow University, and his colleagues, found that the gap between the

number of deaths of people on high incomes and the number of deaths of those on low incomes in

green areas was half that compared with figures relating to builtup areas.

     Green spaces, classified by the researchers as "open, undeveloped land with natural vegetation",

encouraged people to walk and be more active. Exercise in these settings could have greater benefits

than exercise elsewhere, the researchers said.

     The benefits potentially go beyond exercise. Studies have shown that being around green spaces

can reduce blood pressure and stress levels, and possibly help patients recover faster.

     A number of researchers have looked at the effects of greenery on our wellbeing. But few studies

had looked at whether living in green areas reduced health inequalities, the Glasgow team said.

     Using information from a landuse database of 2001, the researchers divided the preretirement

population of England into four groups according to income level, and five groups according to access

to green space. They then looked at death rate for 2001-2005.

     They found that the inequality in death rate from all causes relating to lack of money was less in

those populations in the greenest areas compared with the figures for people living in more builtup

places. They found an even stronger relationship when it came to deaths from certain diseases such

as heart conditions and stroke (中风). There was no difference, however, in deaths from lung cancer.

     The researchers said that changing the physical environment was an easier way to fight against poor

health than using media campaigns or giving out information on health. "The result of the study is clear,

environments that promote good health might be very important in the fight to reduce health inequalities."

1. The underlined word "that" in Paragraph 2 refers to ________.

A. the gap                          

B. the number of deaths

C. the income                      

D. the living area

2. What was the special point of the Glasgow team's research? 

A. They offered a scientific definition of "green spaces". 

B. They encouraged people to exercise in green areas.

C. They studied the effects of greenery on people's diseases.

D. They focused on the influence of greenery on health inequalities.

3. What advice would the researchers probably give according to the last paragraph? 

A. More health information should be given to the public.

B. People should take more exercise every day.

C. More trees and grasses should be planted in cities.

D. People should fight against health inequality.

4. What is the main idea of the passage?  

A. People should live in green areas.

B. Green spaces promote good health.

C. Income influences health less than environment.

D. Exercise in green areas benefits people a lot.

硬度试验有什么特点？