阅读下面的短文，并根据短文内容回答问题。（共5小题，计10分）

???? More than 6000 languages are spoken on the earth today.Many of these languages are spoken by small groups of people,and over 200 languages are spoken by one million or more people.Chinese is a language spoken by the largest number of people in the world.But English is most widely spoken in the world

????? English is spoken by more than 400 million people as their first language.It is spoken by most people in the U.S.A.,Great Britain,Canada,Australia and New Zealand.And it is also used very widely in many other countries of the world.

????? Look at the back of your watch.You may see the English words? “Made in China”, “Made in Japan”,or “Made in Germany”.English is spoken as the first language in none of these countries.Why are English words written on it?That is because in the modern world English is widely used for business between different countries.

1.How many languages are spoken on the earth today?

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2.Which language is spoken by the largest number of people in the world?

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3.Is English spoken by more than 400 million people as their first language?

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4.Do? Americans speak English ?

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5.Why may English words be written on your watch?

Soon computers and other machines will be able to remember you by looking at your eyes! The programme works because everyone’s eyes are different. So in the future you won’t have to remember a number when you want to use a machine or take money out of a bank. You’ll just have to look at the machine and it will be able to tell who you are.
The eye-recognition(眼睛识别) programme is already being tested in shops and banks in the USA, Britain, Spain, Italy and Turkey. Soon, this technology will take the place of all other ways of finding out who people are.
However, scientists are working on other systems. Machines will soon be able to know you from the shape of your face or hand or even your smell! We already have machines that can tell who you are from your voice or the mark made by your finger.
Eye-recognition is better than other kinds because your eyes don’t change as you get older, or get dirty like hands or fingers. And even twins have different eyes, so the programme can be up to 94% correct, depending on(依靠) how good the technology is. Some programmes may only be right 51% of the time. In Britain, it was found that 91% of people who had tried it said that they liked the idea of eye-recognition.
In the future your computure will be looking at you in the eye. So smile!
【小题1】 How does the eye-recognition programme work?

Three kids have been learning chemistry for only a few months. But they have already begun to challenge (挑战) a world famous scientist!
Li Weichi, Huang Runling, and Xiao Yan are from Zhongshan Huaqiao Middle School in Guangdong. They have just found a red cabbage that could be a new kind of acid-base indicator (酸碱指示剂). They want it to take the place of litmus (石蕊) paper.
"We've learnt to think of and ask questions about life by ourselves," said Li, "We work well with each other."
British scientist Robert Boyle discovered the use of litmus paper over 300 years ago. Now it is used widely in experiments all over the world.
But when the kids did some experiments in class last winter, they saw that the litmus paper didn’t turn very blue with base matter. It's hard to get a clear result.
Will there be a better indicator than litmus paper? The three kids decided to try and find out!
How? They went to collect over 40 plants in parks, gardens and markets. Then they ground (研磨) leaves, flowers and stems (茎) to get the pigments (色素) from them.
The kids mixed pigments with acid and base. They spent months watching carefully to see which paper showed the best color change. They decided it was the litmus paper!
"It's our first scientific journey, Huang said, "But it makes me want to try harder."
【小题1】Whom did the three kids want to challenge?