为探究“废电池对生物的影响”，某研究小组设计了如下实验步骤：
①将一节用过的五号电池破碎，浸泡在1000mL清水中3天，过滤得到滤液。②四只鱼缸分别贴上A、B、C、D标签，并在鱼缸中都加入5000mL清洁无污染的河水。③在A、B、C、D四只鱼缸中，依次加入50mL、100mL、200mL、400mL的电池浸出液。④再向各鱼缸中分别加入三条大小和生活状态差不多的小金鱼，定时喂等量同种饲料，观察并记录情况。

结果如下表： 

                      A    B    C    D
所加浸出液的体积(mL)  50  100  200  400
小鱼存活的时间(天)    15   12   7    1
根据以上设计，请回答下列问题：

（1）该小组同学提出的问题是：__________________________________________________。

（2）根据表中的数据可知，水中电池浸出液的浓度越大，金鱼存活的时间就越_______。

（3）由此，该小组同学得出结论：废电池对生物有影响。你认为他们这样得出结论严谨？
答：__________。为什么？_________________________________________。

（4）请你对使用过的电池如何处理作出合理化的建议：_______________________。

Right in the middle of the town are some long ponds(水池). They are only about half a foot deep. The men of Symi dug out the earth to make the ponds.
Over each pond is a low cover. It is made of glass that you can see through.
At night, sea water is taken into the ponds. The next day, the hot sun shines through the covers. The sun light turns the water into vapor(水蒸气) and the vapor goes up from the ponds. The salt is left behind.
As it goes, the vapor became mist. On the inside of each cover, the little drops of mist run together to make big drops. These drops run down the sides of the cover, filling other ponds with fresh water.
The salt left in the ponds is washed out each night. Then more sea water is taken in. The factory is ready for the next day’s work. The covers and other parts of the factory cost very little. Sea water and sun cost nothing. Most people of Symi are poor. So to them this new way of getting fresh water seems wonderful.
【小题1】 Where are the little drops made into big drops?

Right in the middle of the town are some long ponds(水池). They are only about half a foot deep. The men of Symi dug out the earth to make the ponds.

Over each pond is a low cover. It is made of glass that you can see through.

At night, sea water is taken into the ponds. The next day, the hot sun shines through the covers. The sun light turns the water into vapor(水蒸气) and the vapor goes up from the ponds. The salt is left behind.

As it goes, the vapor became mist. On the inside of each cover, the little drops of mist run together to make big drops. These drops run down the sides of the cover, filling other ponds with fresh water.

The salt left in the ponds is washed out each night. Then more sea water is taken in. The factory is ready for the next day's work. The covers and other parts of the factory cost very little. Sea water and sun cost nothing. Most people of Symi are poor. So to them this new way of getting fresh water seems wonderful.

1. Where are the little drops made into big drops?

    A. On the inside of the covers.      

    B. In the ponds with fresh water.

    C. On the walls of the salt water ponds.                

    D.Between the fresh water and the salt water.

2.The men of Symi dug some long ponds        .

    A. in order to keep sea water        

    B. in order to get hot water inside

    C. in order to fill them with fresh  

    D. in order to get fresh water

3.Which picture shows the right way to get fresh water in Symi?

4.Which of the following is NOT true?

    A. The sea water is taken into the ponds at night every day.

    B. There is a very big river running through the town to the sea.

    C. The people in Symi can get fresh water from the factory.

    D. People may see the water in the ponds through the cover.