1 . From goldfish to sharks, fish of all sizes have lived on Earth for hundreds of millions of years. But do they ever get thirsty?
The answer is yes! Some fish do, at least. But there is a big difference between fish that live in saltwater and ones that live in freshwater.
Bony fish have some salt concentration（含盐量）in their bodies. For bony fish in saltwater, their concentration is lower than the water they live in. Through osmosis（渗透作用）these fish will lose lots of water through their bodies. In order to make up for this loss, they drink lots of water, so it’s easy to say that they can be thirsty. Although drinking saltwater is never a good idea for humans, fish can drink it because they can get rid of the salt through their gills（鳃）.
But sharks are an exception. Sharks can make their salt concentration match the water around them. They do this by building up urea（尿素）in their blood, so they probably don’t get very thirsty. But blood with a high salt concentration can also be bad. The high concentration means sharks won’t do very well in freshwater—water can enter the sharks’ bodies by osmosis and even cause them to explode!
Freshwater fish, on the other hand, are unlikely to become thirsty. Because they live in a less salty environment, they have a different problem: water goes inwards and dilutes（冲淡）their blood. Freshwater fish therefore need to get rid of this extra water. So now we know that saltwater fish can become thirsty and drink water, while freshwater fish will avoid drinking but pee（小便）a lot.
1. What’s the main idea of this story?| A．Fish have a long history of living on Earth. |
| B．Fish of all sizes can become thirsty like humans. |
| C．Fish drink saltwater when they get thirsty. |
| D．Fish are different in terms of whether they get thirsty. |
| A．Because they have a high salt concentration. |
| B．Because they need to take in salt through their grills. |
| C．Because they will lose lots of water through their bodies. |
| D．Because they become thirsty more easily than humans. |
| A．To prove that they are the most unusual creatures in the sea. |
| B．To prove that freshwater is not good for them to live in. |
| C．To prove that not all saltwater fish drink lots of water. |
| D．To prove that they are dangerous because they may explode. |
| A．They don’t get thirsty at all because they live in saltwater. |
| B．Too much water in their blood can be bad. |
| C．They get thirsty and drink water just like saltwater fish. |
| D．They pee a lot after drinking too much water. |
| A．A fashion magazine | B．A travel guide | C．A science book | D．A storybook |
House of Commons
London
SW1AOAA
Monday 12th March, 2007
Dear Mr. Heppell,
I am Sabrina Akhtar studying in a high school and I’ve noticed that forests are disappearing.
You know, forests are disappearing around the world each year because of many different reasons including farming, tourism, pollution, etc. If we stop doing these things, there will be a good future for people of tomorrow.
Now I’m writing to ask you to help stop forests from disappearing. You can help by getting shops to stop selling paper made from trees and by persuading people not to use tree-free paper (paper not made from trees). This will help forests so much. There are many, many things we can do to help forests. If you would like to know more, please visit http://www. Rainforestweb. Org/. By changing the little things, we can make a big difference.
If you would like to contact（联系）me, please see the above address or e-mail me at shazadinol @ hotmail.co.uk. Thank you for taking your time in reading this letter.
Yours sincerely,
Sabrina Akhtar
1. The writer of this letter is ______.
| A．a student | B．a teacher |
| C．an officer | D．a driver |
| A．Rain | B．Tourism |
| C．Planting | D．Breathing |
| A．stop shops from using paper any more |
| B．use paper which is made from tress |
| C．stop shops selling paper made from trees |
| D．plant more and more trees in the future |
| A．By calling her | B．By interviewing her |
| C．By visiting her | D．By e-mailing her |
| A．To know more about Mr. Heppell |
| B．To make friends with Mr. Heppell |
| C．To ask Mr. Heppell to teach in the school |
| D．To ask Mr. Heppell to help protect forests |
In 1995, Ma Yun was working for a US trading company（公司）when he was introduced to the Internet."I know nothing about computers and has never touched a keyboard," he said.He searched the word "beer" and nothing came up about Chinese products.
Ma Yun had an idea.Why not build a large Internet market to connect customers with companies from all over the world? They could do business online in that way.That was how Alibaba began.His company grew quickly.But that didn't mean everything went smoothly.In 2000, many Internet companies failed including Alibaba.But later, he was successful because he managed to attract(吸引) investment（投资）into his company."You should stick to your dream," he said."Everyone thought I was daydreaming when I started.But the most important thing is that we believe in our dream from past to today and tomorrow.Of course we made many mistakes, but we never give up."
Ma Yun is also smart.For him, success in business is like trying to catch a rabbit.If there are nine rabbits, focus on catching one - don't try to catch them all," he said."Change your ways if you need to, but don't change the rabbit.Get one first, put it in your pocket and then catch the others."
1. What does the word "it" mean in Paragraph l?
| A．The young hero Ali Baba. | B．The phrase "Open Sesame". |
| C．The website. | D．The old story. |
| A．was introduced to the Internet in 1995 |
| B．was working in America |
| C．decided to buy and sell Chinese beer |
| D．bought a keyboard from Internet |
| A．He founded his own company. |
| B．His company grew quickly and smoothly. |
| C．His company failed like many others. |
| D．He was successful though he had no investment. |
| A．We should always daydream like Ma Yun. |
| B．We should never give up hope like Ma Yun. |
| C．Ma Yun seldom made mistakes. |
| D．People should try to put nine rabbits in their pockets at the same time |
| A．Ma Yun's treasures. |
| B．The importance of working hard. |
| C．The secrets of Ma Yun's success. |
| D．Ma Yun's hobby - catching rabbits |
