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Dolphins are mammals, not fish. They are warm blooded like man, and give birth to one baby, called a
calf, at a time. At birth, a bottlenose dolphin calf is about 90-130 cms long and will grow to approximately
4 metres, living up to 40 years.
They are highly sociable animals, living in groups, called pods, which are fairly fluid, with dolphins from
other pods interacting with each other from time to time.
Dolphins carry their young inside their womb for about 12 months. The baby is born tail first, and its
mother will feed the calf for up to 2 years.
However, the calf will stay with its mother for between 3-6 years, during which time it will learn all
about feeding techniques, social interaction and group hunting.
B. A baby
C. A womb
D. A calf
CONCORDE, the world"s fastest passenger plane, will soon be over 33 years old. It first 1.______
on 2 March 1969 in France. Concorde was developed by both France and Britain. From 1956 these two
countries had a 2.______ of a supersonic passenger plane. In 1962 they started to 3.______ together on
the project. The plane 4.______ over 1.5 billion pounds to develop. It is the most tested plane in the history.
It was given over 5000 hours of testing. Concorde flies at twice the speed of 5.______. This means that
it 6.______ only 3 hours 25 minutes to fly between London and New York, compare with 7-8 hours in
other passenger jets. Because of the five-hour time difference between the USA and Britain, it is 7.______
to travel west on Concorde and arrive in New York before you leave London! You can catch the 10:30a.m.
8.______ from London, Heathrow and start work in New York an hour 9.______! Concorde is much used
by business people and film stars. Each Concorde is built at a cost of 55 million pounds. Twenty have been
built so far. Air France and British Airway 10.______ the most. They each have seven planes.
day. The Internet brings the outside world closer to people"s homes. Some people say the world is smaller than
before because of the Internet.
What"s going on in other countries? How do people live in places far away? Is there a good sports game somewhere? What"s the life like in the deepest part of the sea? If you want to answer all these questions just come to
the Internet. Of course people can also learn through reading or listening to the radio. But with the Internet they
can learn better and more easily. A lot of information (信息) can be collected at a great speed.
Can we go shopping without leaving home? Can we see a doctor without going to the hospital? Can we study without going to school? Can we draw money without going to a bank? All these things seemed to be impossible but now they have become quite possible. The Internet helps us open our eyes. The Internet also helps us open
our minds. The Internet often gives us new ideas. In a word it helps us in many ways. Great changes have taken place in our life since the use of the Internet.
B. the Internet makes the earth smaller in size
C. the Internet brings the outside world closer to them
D. exploring the Internet is one of the most important activities of the day
your hands. In the second basin mix hot water with cold water. Fill the third basin with cold water from the
tap (水龙头).
Now place the basins on the table. Put your right hand in the hot water. Put your left hand in the cold
water. You will find that your right hand feels hot and your left hand feels cold. After twenty seconds move
both your hands in the lukewarm (微温的) water. What do you feel? Your left hand feels warm and your
right hand feels cold. But both hands are in the same basin of water.
B. cold water
C. basins
D. an experiment
"day" to mean 24 hours. But when we talk about day and night, we are using "day" to mean the time
between sunrise and sunset. Since the earth looks like a ball, the sun can shine on only half of it at a time.
Always one half of the earth is having day and the other half night. A place is moved from day into night
and from night into day over and over by the spinning (旋转)of the earth. At the equator (赤道) day and
night are sometimes the same length. They are each twelve hours long. The sun rises at 6 o"clock in the
morning and sets at 6 o"clock in the evening. For six months the North Pole is tilted (倾斜) toward the sun.
In those months the Northern Hemisphere (半球) gets more hours of sunlight than the Southern
Hemisphere. Days are longer than nights. South of the equator nights are longer than days. For the other
six months the North Pole is tilted away from the sun. Then the Southern Hemisphere gets more sunlight.
Days are longer than nights. North of the equator nights are longer than days. Winter is the season of long
nights. Summer is the season of long days.
B. the pulling
C. the spinning
D. the passing
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