若需要多个提交按钮的Web表单，如何确定是哪一个提交按钮被单击？

2006年8月下旬科特迪瓦的“毒垃圾”事件造成了严重的环境污染．这些毒垃圾在雨水的浸泡下，散发出类似臭鸡蛋的刺鼻气味，并随雨水流到河流和地下．

（1）据当地科研人员说具有类似臭鸡蛋气味的气体可能就是H₂S和溴（化学式为Br₂，其性质与氯气相似），如果用CaS表示这些污染物中的硫化物，其与水反应的化学方程式为______．

（2）产生的溴可能是酸性环境中溴Br^-和BrO₃^-发生化学反应而形成，其反应的离子方程式为______．

（3）要消除这些污染物可用______（填试剂的化学式或分子式）溶液来处理．

五一长假即将来临，作为初三毕业生的你，打算怎样度过这个假期？你会和家人去旅行还是呆在家里认真复习？根据下面的建议，请你给自己写个五一假期计划。

我先要制定好计划如何安排我的假期,以确保劳逸结合。

我要认真完成所有的作业，绝不马虎对待。必要时打电话问老师。

我还要进行体育锻炼,为严格的体育考试做准备。

我还要……。

要求：涵盖以上要点，不出现真实姓名。

字数在80左右，开头已给出，不计入词数。

The May Day holiday is coming soon. As a senior, who will finish school in less than sixty days, I will make full use of the holiday.___________________________________    

诗歌赏析。                                               （4分）

十五夜望月　　唐·王建

中庭地白树栖鸦，冷露无声湿桂花。今夜月明人尽望，不知秋思落谁家？

小题1:请简要分析“树栖鸦”三字。                                           

____________________________________________________________________________

_____________________________________________（2分）

小题2:“不知秋思落谁家”中的 “落”字有何妙处？                          

____________________________________________________________________________

____________________________________________________________________________

__________________________________（2分）

“没有一个人富得能购买他人，没有一个人穷得被迫出卖自己。”以上卢梭的经济思想表明他：（）

A.强烈反对财产私有制

B.主张废除资产阶级所有制

C.向往小农经济社会

D.反对贫富悬殊不反对私有制

About ten men in every hundred suffer from color blindness in some way. Women are luckier; only about one in two hundred is affected in this matter. Perhaps, after all, it is safer to be driven by a woman!

There are different forms of color blindness. In some cases a man may not be able to see deep red. He may think that red, orange and yellow are all shadows of green. Sometimes a person cannot tell the difference between blue and green. In rare cases an unlucky man may see everything in shades of green －a strange world indeed.

Color blindness in human beings is a strange thing to explain. In a single eye there are millions of very small things called “cones”. These help us to see in a bright light and to tell difference between colors. There are also millions of “rods”, but these are used for seeing when it is near dark. They show us shape but no color.

Some insects have favorite colors. Mosquitoes prefer blue to yellow. A red light will not attract insects, but a blue lamp will. In a similar way human beings also have favorite colors. Yet we are lucky. With the aid of the cones in our eyes we can see many beautiful colors by day, and with the aid of the rods we can see shapes at night. One day we may even learn more about the invisible colors around us.

1. The passage is mainly about _____________.

A. color and its surprising effects.            B. women being luckier than men

C. danger caused by color blindness          D. color blindness

2. According to the passage, with the help of the “cones”, we can_______________.

A. tell different shapes                    B. see in a weak light

C. kill mosquitoes                        D. tell orange from yellow

3. Why do some people say it is safer to be driven by women?

A. Women are more careful.              B. There are fewer color-blind women

C. Women are fonder of driving than men.    D. Women are weaker but quicker in thinking.

4. Which of the statements about the color- blind is true?

A. Not all of them have the same problem in recognizing color.

B. None of them can see deep red.

C. None of them can tell the difference between blue and green.

D. All of them see everything in shades of green.

5. We can attract and kill mosquitoes by using a _____________.

A. red light       B. yellow light          C. blue light        D. green light