在利润敏感性分析中，如果企业正常盈利，则对利润影响程度最高的因素是（）。 A.单价

Apparently，we are safe neither at home nor in the business office．We use water in both places，but the research shows that chemicals added to our local water supply to kill harmful bacteria can have unwanted side effects．These chemicals can cause potential harm through drinking and in seemingly harmless activities as cleaning one’s house．They are released(set free)from water by daily actions like water running out of tap，spraying from garden pipes，or splashing in dishwashers and washing machines．As the water is moving．these chemicals are released into the air and then breathed in. Once inside our bodies, they start to affect our health.

Does this mean we should stop bathing? No, say the scientists, but we should put all pollution into perspective. Activities at home such as the burning of coal, cooking oil, or even candles release carbon monoxide and particulates such as cigarette ashes which have been proven as harmful to health as working or living near heavy traffic. New tugs, bedding, and even clothing give off that“new smell, ”which is a sure sign of chemicals. In the office, newly applied paint, newly purchased telephones and other telecommunications equipment, and computers release polluting chemicals, too. As offices and homes often have inadequate ventilation (通风), these chemicals can build up to become health problems. Their poisonous effects are only now being slowly recognized.

These facts suggest that, at a minimum, proper airing of newly purchased goods with an obvious chemical smell is a wise warning. Home and office windows should be opened during good weather. Even one’s car needs to be ventilated as well while in the garage.

We need further research to understand better other potential health dangers, too. For example, the effects of overcrowding of schools (carbon dioxide build-up ), the factory work environment ( an endless list of potentially dangerous substances ), and even home heating and cooling (the air conditioner may be our enemies, not our friends) have only recently started to come to light. Until we understand the effects of our new technological environment better, we can only hope that“there is no place like home.”

64．What is the main idea of the first paragraph?

A．The air we breathe in is harmful.

B．The water in everyday use is unsafe.

C．Chemicals are added to the drinking water.

D．Chemicals are released in the running water.

65．In Paragraph 2, the underlined sentence means that       .

A．bathing should be done with caution

B．homes and offices should be aired often

C．any pollution should be taken into consideration

D．we should prevent any pollution from doing harm to us

66．What is the purpose of the passage?

A．To call on us to guard our water.

B．To show us that no place is like home.

C．To make us aware of the pollution around us.

D．To argue that neither homes nor offices are safe.

已知化学反应①：Fe（s）+CO₂（g）=FeO（s）+CO（g）,其平衡常数为K₁；

化学反应②：Fe（s）+H₂O（g）=FeO（s）+H₂（g）,其平衡常数K₂。

在温度973 K和1173 K情况下，K₁、K₂的值分别如下：

温度	K1	K2
973 K	1.47	2.38
1173 K	2.15	1.67

（1）通常表格中的数值可以推断：反应①是____________（填“吸热”或“放热”）反应。

（2）现有反应③：CO₂（g）+H₂（g）=CO（g）+H₂O（g）,请你写出该反应的平衡常数K₃的数学表达式：K₃=____________。

（3）根据反应①与②可推导出K₁、K₂与K₃之间的关系式____________。据此关系式及上表数据，也能推断出反应③是____________（填“吸热”或“放热”）反应，要使反应③在一定条件下建立的平衡向正反应方向移动，可采取的措施有____________（填写序号）。

A.缩小反应容器容积    B.扩大反应容器容积        C.降低温度    D.升高温度

E.使用合适的催化剂    F.设法减少CO的浓度

对输送易燃、易爆介质的管道对地电阻不得大于（）Ω。

A、10

B、30

C、50

D、100

依法追究事故企业主要负责人或企业实际控制人的法律责任，得到此项责任追究的是（）。

构成生物膜的主要结构成分是______

A．甘油三酯和磷脂
B．甘油三酯和胆固醇
C．磷脂和胆固醇
D．磷脂和糖脂
E．磷脂和核酸