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：_______________________。

His newly bought mobile phone is equipped with two ________ (电池), which may save a lot of time.

A Nepali teenager has designed a ￡23 solar panel（太阳能电池板）using human hair．

Milan Karki, who is 18 years old and lives in a village in rural Nepal, used human hair to replace silicon, which is a common but expensive material of solar panels．

　　 By using hair as a replacement, Karki said that solar panels can be produced for around ￡23, aprice tag that could be halved if they were mass-produced．

　　 The solar panel works because melanin, which gives hair black color, is light sensitive and can act as an electrical conductor．Karki was inspired to follow this route by a Stephen Kawking' s book, which explained how to create static （静电的） energy from hair．

The device that Karki has showed and proved is able to produce 9V or 18W of energy—plenty to charge a mobile phone．

"Half a kilo of hair can be bought for only ￡16 in Nepal and lasts a few months, while a pack of batteries would cost ￡50 and last a few nights, " according to The Daily Mail．

Karki and his four classmates firstly made the solar panel as an experiment but the teens are convinced it has wide applicability and commercial viability （可行性）．

Karki has now sent out several devices to other districts near his home for testing．He said, "First I wanted to provide electricity for my home, then my village．Now I am thinking for the whole world．"

56．What is special about Karki's solar panel?

　 A．Karki' s solar panel has static energy．

　 B．Karki uses a very expensive material in his solar panel．

　 C．Karki puts man' s hair to use in his solar panel．

　 D．Karki uses his solar panel to charge the cell phone．

57．Karki' s idea about designing his solar panel results from __　　 .

　 A．his teacher's instruction

　 B．a book written by a famous physicist

　 C．his classmates' experiment

　 D．a report in The Daily Mail

58．Karki' s attitude to the application of his solar panel is 　　　 .

　 A．optimistic　　　　　 B．uncertain　　　 C．serious 　　　　　　　　 D．negative

59．The text can probably be read in ______．

　 A．an advertisement　　 B．a text book　　 C．a magazine　　　　　　 D．a newspaper

A Battery’s Nightmare
Portable electronics that can be carried about easily are only as good as their batteries (电池) and, let’s face it, batteries aren’t very good, especially when compared with, say, petrol, which packs 100 times a battery’s energy into an equal space. That’s why a large group of mechanical engineers (centered at the Massachusetts Institute of Technology, but with partners at other universities and companies) are hard at work in an effort to replace batteries with a tiny engine that runs on fuel. Imagine a battery-free life! When the fuel runs out in your mobile phone, you just fill up and go.
The engine---about the size of a ten-cent coin---starts with a combustion chamber (燃烧室) that burns hydrogen. Its tiny parts are etched (蚀刻) onto silicon wafers (硅片) in the same manner that computer parts are etched onto integrated circuits (集成电路). The first engine is made up of five wafers. And since these wafers could be produced in much the same way as computer chips, they could probably be produced quite cheaply.
But the devil in all this nice detail is efficiency. Tiny engine parts don’t always behave like the bigger parts of the first engine. Something between the parts can slow down the works, according to Columbia University Professor LucFrechette, one of the engine’s designers. Extreme heat from the combustion chamber is also a problem, often leaking to other parts of the engine.
The scientists’ goal is to create an engine that will operate 10 times better than batteries operate. Frechette says that a complete system, with all parts in place and working, will be set up in the next couple of years, but commercial models aren’t likely until at least the end of the next ten years.
【小题1】According to the passage, the title suggests that _______ .

A Battery’s Nightmare

Portable electronics that can be carried about easily are only as good as their batteries (电池) and, let’s face it, batteries aren’t very good, especially when compared with, say, petrol, which packs 100 times a battery’s energy into an equal space. That’s why a large group of mechanical engineers (centered at the Massachusetts Institute of Technology, but with partners at other universities and companies) are hard at work in an effort to replace batteries with a tiny engine that runs on fuel. Imagine a battery-free life! When the fuel runs out in your mobile phone, you just fill up and go.

The engine---about the size of a ten-cent coin---starts with a combustion chamber (燃烧室) that burns hydrogen. Its tiny parts are etched (蚀刻) onto silicon wafers (硅片) in the same manner that computer parts are etched onto integrated circuits (集成电路). The first engine is made up of five wafers. And since these wafers could be produced in much the same way as computer chips, they could probably be produced quite cheaply.

But the devil in all this nice detail is efficiency. Tiny engine parts don’t always behave like the bigger parts of the first engine. Something between the parts can slow down the works, according to Columbia University Professor LucFrechette, one of the engine’s designers. Extreme heat from the combustion chamber is also a problem, often leaking to other parts of the engine.

The scientists’ goal is to create an engine that will operate 10 times better than batteries operate. Frechette says that a complete system, with all parts in place and working, will be set up in the next couple of years, but commercial models aren’t likely until at least the end of the next ten years.

According to the passage, the title suggests that _______ .

A. batteries should be greatly improved

B. petrol will be used instead of batteries

C. the time of batteries will be gone forever

D. pollution problems caused by batteries must be solved

What’s the meaning of the underlined word “devil” in paragraph 3?

A. Problem     B. Advantage     C. Invention     D. Technique

What can we infer from the passage?

A. The new invention doesn’t need any fuel.

B. The new engine has been produced in large quantities.

C. The new invention is much cheaper than the battery.

D. The new engine needs to be improved before it’s on sale.