Scientists warn today that the Atlantic bluefin tuna（金枪鱼）faces disappearance unless certain action is taken. They used electronic ways to track the movement of the powerful fish from the Gulf of Mexico to the Mediterranean, and report today in the journal Nature that meals of sushi and sandwiches with tuna worldwide are more dangerous than anyone has imagined.

The bluefin tuna can live for 30 years, grow to three metres in length and weigh as much as 700kg. A good one can fetch as much as £ 52,000 in the Tokyo fish markets. “In my lifetime, we’ve brought this big fish to the doorstep of death in the western Atlantic Ocean,” said Barbara Block of Stanford University in California. “The electronic way of tracks provides the best scientific information we’ve ever had to manage these tuna and we must, as an international community, start to act actively to make sure of the future of this fish. ”

Scientists have repeatedly said that the harvest of the seas cannot be as good as before. There are fewer and fewer fish in around Newfoundland, North Sea and Iceland, so fishermen have pushed further offshore in search of deep ocean fish. Tuna—in the Mediterranean and Japan—have been under increasing pressure for years. The International Commission on the Conservation of Atlantic Tuna has tried to manage the fish since 1969．There are two populations: a western one that has dropped by 80% in the past 30 years, and a larger, eastern population. Although catches are controlled by 3,000 tons a year in the western fishery, and 32,000 in the east, no one knew whether the limits worked.

So Professor Block and her team placed tracks on hundreds of the fish and tracked them to depths of more than 900 metres and on journeys of thousands of miles, measuring the movement, body and water temperatures. “There are two ways to save the Atlantic bluefin tuna—protect them in their production grounds and in their feeding grounds,” Prof. Block said. “This will need immediate action in both the central Atlantic, to reduce the loss of the big fish while hunting, and in the Gulf of Mexico and Mediterranean, where tuna produce as separate populations. ”

1. The bluefin tuna in this passage mainly refers to the one _______.

2.Which of the following is NOT true according to this passage?

3.According to Professor Block, tuna can be saved by ______.

4.The purpose of the passage is to ______.

About 97% of the world’s water is salty and is found in our oceans and seas. But, as we can’t drink sea water, how can it be important?

Every part of our seas and oceans contains an amazing number of animals and fish that live at different ocean depths. Most of the different species of animals and fish depend on simple plants for their food. These simple plants called algae (海藻) drift near the surface of the ocean and use sunlight to turn carbon dioxide and water into food and oxygen. In fact, algae produce over half of the oxygen people breathe. How important sea water is!

Each plant or animal in our seas and oceans is an important link in a food chain. The algae are eaten in large amounts by microscopic animals, which are in turn consumed by larger animals. These food chains are delicately balanced.

The bad news about the food chains in the oceans is that they are under threat because of man. People once thought that the oceans were so big that it didn’t matter if we dumped rubbish into them or caught huge quantities of fish and whales for food. But we now know this is not true and fish stocks in the oceans have started to drop.

Thankfully, the world is taking steps to protect the future of our oceans by introducing international agreements to protect marine habitats. Most countries have introduced fishing restrictions to protect fish stocks in the oceans and new techniques are being pioneered to cope with pollution. Finally, the importance of protecting oceans is being made known to more people. This is just the beginning of a long process to protect the oceans for our future. We depend on the oceans for fish which are an important part of the human diet. How important sea water is! 

46. Which of the following is the proper order of the food chain?

A. small animals→algae→microscopic animals→large animals→man

B. algae→microscopic animals→large animals→larger animals→man

C. small animals→algae→large animals→microscopic animals→man

D. microscopic animals→algae→large animals →larger animals→man

47. People used to think that the rubbish thrown into the sea ________.

A. wouldn’t harm the fish in the sea   B. would change the balance of the food chain

C. would be broken down in the sea   D. wouldn’t do much harm to the sea

48. From the passage, we learn that _________. 

A. most fish and sea animals live at the surface of the seas

B. it is very difficult to break the balance of a food chain

C. excessive fishing has caused the decrease in fish stock

D. it won’t be long before the problems concerning oceans will be solved

49. Which of the following is NOT a way being used to protect oceans?

A. The use of international agreements.   

B. Forbidding fishing to protect fish stocks.

C. The use of new techniques.          

D. Raising people’s awareness of the need to protect oceans.

50. What would be the best title of the passage?

A. The importance of seawater.

B. Life in the oceans.

C. How to protect food chains.

D. How to deal with seawater pollution.

This practice satisfies people of high moral standards psychologically and materially and ______ encourages other people’s enthusiasm.

A．on the contrary     B．in the meantime    C．from time to time    D．all at once

A good night’s sleep in the early years of life could be very important in preventing a child becoming obese, say scientists. Babies and pre-school children who sleep for less than ten hours a night are more likely to be overweight when they are older, research has found. Experts believe that those who do not get enough sleep are more likely to feel hungry and want more calorie-rich food during the day.

Former research has linked sleeping with obesity in adults and teenagers, but this is one of the first to look at very young children. Researchers from the Universities of Washington and California looked at the sleeping habits of almost 1,000 children under the age of five. They found those who had less than ten hours’ sleep were twice as likely to be overweight five years later.

Childhood obesity has doubled over the past 10 years. A quarter of secondary school pupils are now judged to be so overweight that their health is in danger. Experts believe sleep, or lack（缺乏）of it, could be a major cause of this. On average children are sleeping for an hour less than they did 30 years ago. Last year Chinese researchers looked at more than 5,000 youngsters and found that those who were able to catch up on （补充）sleep at the weekend were far less likely to get body weight problems. Scientists have also found a link between lack of sleep and diabetes（糖尿病）. Last year Canadian researchers discovered those who did not get seven or eight hours’ sleep a night were two and a half times more likely to become sick.

1.The underlined word “obese” in the first paragraph may mean       .

A．quite protective          B．very sad        

C．very fat                  D．quite young

2.According to Chinese researchers, if a person who lacks sleep can get more sleep during weekends,       .

A．he won’t get hungry easily          B．he will feel tired all the time

C．there will be little chance of him becoming fat

D．it will be very hard for him to fall asleep at night

3.From the passage we know       .

A．too little sleep will result in illness besides obesity

B．in the past people didn’t connect sleep with weight

C．fat children must have slept less than 10 hours five years ago

D．most children are unhealthy because of little sleep

4.What would be the best title of the passage?

A．A good night’s sleep helps the development of kids’ brain!

B．Ten hours’ sleep prevents overweight in kids!

C．Children are sleeping much less nowadays!

D．More teenagers get weight problems!

5.Where can you most probably read this passage?

A．In the latest news.           B．In a children’s book.

C．In a health magazine.        D．In a scientist’s diary.

Another man-made wonder of the US was built long before the nation was established. About 900 years ago, the Ancestral Puebloan people built villages high in the walls of canyons（大峡谷）in Colorado, where 600 cliff dwellings are now part of the Mesa Verde National Park.    

Visitors can stand at the top and look into the dwellings almost hidden in openings of the rock walls.The Puebloan people cut small steps into the rock, which connected buildings containing hundreds of rooms.

The rock walls have protected the buildings from severe weather in the area; therefore, they remain mostly unchanged in the hundreds of years since they were built.

Our final man-made wonder is in the northwestern city of Seattle, Washington. The Space Needle was built as the central structure for the 1962 World’s Fair.          

The 184-meter-tall structure was designed by Edward Carlson, which has a wide base on the ground, with its middle narrow and a large ring-like structure on top.The structure was meant to look like a “flying saucer,” a vehicle that was popular in science fiction space travel stories. The saucer includes an observation area and eating place.The restaurant slowly turns to provide visitors with a 360 degree view of Seattle.

The Space Needle was not very costly, and was designed and completed in about a year and opened on the first day of the World’s Fair.

Today, the Space Needle is the most popular place for visitors to Seattle. And it remains the internationally known symbol of the city.

What can be talked about before the text?

       A. American geography.

       B. Touring in the USA.

       C. Other US artificial wonders.

       D. World natural wonders.

The underlined word “dwelling” is closest in meaning to “????????????________”.

       A. houses       B. people C. canyons      D. steps

The buildings in the rock stay almost unchanged because________.

    A. the weather there is severe

    B. they were well built

    C. people look after them well

    D. the rock walls protect them

Which is true of the Space Needle?

       A. It remains a symbol of the US.

       B. Edward Carlson built the structure.

       C. It has a ring-like structure on top.

       D. It is a man-made wonder in Colorado.

What is the best title of the text?

       A. Cultural Relics          B. Artificial Wonders in the US

       C. Symbols of Cities    D. Natural Places in the US