Doing experiments can be interesting, and you may try the following experiments at home. Make sure that you’ll do them with an adult.

【小题1】How many experiments are there in the pictures?

A．Six.

B．Five.

C．Three.

D．Two.

【小题2】The following are the instructions on how to do “Step 2” in these experiments. Which one is the right order?
a. Pour 3/4 of the water away. 
b. Put a balloon on the bottle.
c. Put the bottle in a bucket of hot water. The air rises into the balloon.

A．a, b, c

B．a, c, b

C．b, a, c

D．c, a, b

【小题3】What can you see in the bottle at last in Experiment A?

A．Some ice.	B．Some water.
C．Some ice and water.	D．A cloud and some water.

【小题4】What will happen to the balloon in “Step 3” in Experiment C?

A．It will be bigger.	B．It will be broken.
C．It won’t change.	D．It will be in the bottle.

Tanzania （坦桑尼亚）has a lot of animals, like lions, elephants, giraffes, hippos（河马）and so on. Every year, many people in the world travel to this country in Africa to watch the animals. But do you know how they travel?

By boat-We can often see many people in a boat, enjoying the beautiful things along a river or a lake, and they can also enjoy the hippos and other animals.
By hot-air balloon（热气球）–In the early morning, when the sun （太阳）is starting to rise, a large hot-air balloon is also starting its tour. Taking a hot-air balloon is very exciting to most of the tourists. You can watch all the animals there. Elephants are drinking water, giraffes are eating leaves and so on. After some time, the balloon can land（着陆）in a place where the waiters would give people a delicious breakfast. But you need to know that taking a hot-air balloon is very expensive. A person should pay 400 dollars for an hour’s trip.
【小题1】In Tanzania.           People travel by          to watch the animals.

A．most; boat

B．most; bus

C．some; boat

D．some; boat

【小题2】People can          from         windows.

A．watch dangerous animals; big	B．play with the animals; big
C．watch dangerous animals; small	D．play with the animals; small

【小题3】 people usually start to tour          by hot-air balloon.

A．in the morning	B．in the afternoon
C．in summer	D．in winter

【小题4】 How much should a person pay for two hour’s trip?

A．200 dollars

B．400 dollars

C．600 dollars

D．800 dollars

【小题5】 From this article, we can know.

A．Tanzania is in North America

B．there are four ways for us to breakfast if you travel by bus.

C．you can enjoy a delicious breakfast if you travel by bus.

D．traveling by hot-air balloon is very expensive.

Have you ever hoped a toy balloon? They are very light. But there are much bigger balloons can fly very high up in the sky. They are big enough to carry people. They are called hot-air balloons.
To make a hot-air balloon go up, turn on the burner(燃烧器). That will make the air inside the balloon hotter. Then the balloon will go up.
To make the balloon go down, turn off the burner. The air inside the balloon will get cooler. Then the balloon will go down. Underneath(在….下面) the balloon there is a large basket. That is where the pilot and the passengers go.
The burner is just above the basket. You can stand in the basket and turn the burner on and off. The balloon will go where the wind is blowing the right way! Do you want the balloon to go somewhere special? First make sure the wind is blowing the right way!
People have been flying in hot-air balloons for over two hundred years. Before planes it was the only way of flying. Today people fly in hot-air balloon for fun. Some people like to race hot-air balloons.
【小题1】A hot-air balloon is ____

A．smaller than a toy balloon	B．bigger than a toy balloon
C．the same as a toy balloon	D．lighter than a toy balloon

【小题2】Where will you sit if you want to fly in the balloon?

A．Inside the basket	B．On top of the balloon
C．Under the basket	D．Inside the balloon

【小题3】You want the balloon to go up. So you will ____

A．jump out of the balloon

B．let the air out of the balloon

C．make the air inside the balloon hotter

D．let the air inside the balloon cool down

【小题4】Now you are high up in the sky. If you want the balloon go down, you will _____

A．make your friends go out of the basket

B．make a hole in the balloon with a knife

C．make the air inside the balloon hotter

D．make the air inside the balloon cooler

【小题5】 Now everything is all right! The balloon is flying across the sky. Where are you going?

A．Towards the sun	B．To the seaside
C．Where the wind blows you.	D．To the nearest mountains

Tanzania （坦桑尼亚）has a lot of animals, like lions, elephants, giraffes, hippos（河马）and so on. Every year, many people in the world travel to this country in Africa to watch the animals. But do you know how they travel?

By boat-We can often see many people in a boat, enjoying the beautiful things along a river or a lake, and they can also enjoy the hippos and other animals.
By hot-air balloon（热气球）–In the early morning, when the sun （太阳）is starting to rise, a large hot-air balloon is also starting its tour. Taking a hot-air balloon is very exciting to most of the tourists. You can watch all the animals there. Elephants are drinking water, giraffes are eating leaves and so on. After some time, the balloon can land（着陆）in a place where the waiters would give people a delicious breakfast. But you need to know that taking a hot-air balloon is very expensive. A person should pay 400 dollars for an hour’s trip.
【小题1】In Tanzania.           People travel by          to watch the animals.

A．most; boat

B．most; bus

C．some; boat

D．some; boat

【小题2】People can          from          windows.

A．watch dangerous animals; big	B．play with the animals; big
C．watch dangerous animals; small	D．play with the animals; small

【小题3】 people usually start to tour          by hot-air balloon.

A．in the morning	B．in the afternoon
C．in summer	D．in winter

【小题4】 How much should a person pay for two hour’s trip?

A．200 dollars

B．400 dollars

C．600 dollars

D．800 dollars

【小题5】 From this article, we can know.

A．Tanzania is in North America

B．there are four ways for us to breakfast if you travel by bus.

C．you can enjoy a delicious breakfast if you travel by bus.

D．traveling by hot-air balloon is very expensive.

On Nov.18th, 1908, three men went up in a balloon. They started early in London. The headman was Auguste Gaudron, and the other two men were Tannar and Maitland. They had a big balloon and they were ready for a long way.

Soon they heard the sea. They were carrying the usual rope, and it was hanging down from the basket of the balloon. At the end of the rope they had tied a metal box. This could hold water, or it could be empty. So they were able to use the box to change the weight of the balloon. The three people were also carrying some bags of sand.

After the sun rose, the balloon went higher. It went up to 3,000 metres, and the air was very cold. The water in the balloon became ice. Snow fell past the men's basket, and they could see more snow on the ground. The men tried to throw out some more sand; but it was hard. They tried to break the icy sand with their knives, but it was not easy. The work was slow and they were still falling, so they had to drop some whole bags of sand. One of them fell on an icy lake and made a black hole in the ice.

　　At last they pulled the box into the basket. It was still snowing; so they climbed to get away from the snow. They rose to 5,100 metres! Everything became icy. They were very cold and  they decided to land. They came down in Poland　heavily but safely. They had travelled 1,797 kilometres from London!

1.Where did they start their travel on Nov.18th, 1908?

                                                                             

2.What was the metal box used for?

                                                                            

3. Why did they have to drop some whole bags of sand during the travel?

                                                                             

4. How long did they travel in the end?

                                                                            

5.

What do you think of the three people and their travel? (请自拟一句话作答)