Monarch butterflies(帝王蝶) from the eastern part of North America make the most amazing journey in the insect world. Each year, this tiny creature(生物) travels up to 3,000 miles(4,800 kilometers) to its winter home in central Mexico(墨西哥). How can it fly so far? And what is the purpose of its long and dangerous trip? Scientists still don’t have an explanation.

The length of the butterflies’ trip is only one part of the mystery. The other amazing thing is that the butterflies always return to the same place in central Mexico. How do the butterflies find their way back to the same place? This is an interesting question because only every fourth generation(代) makes the trip south. In other words, the butterfly that travels to Mexico this year is the great-great-grandchild of the butterfly that traveled there last year.

Each year, four generations of a Monarch butterfly family are born. Each generation of the family has a very different life. The first generation of Monarchs is born in the south in late April. It slowly moves north, reproduces, and then dies. On the trip north, two more generations are born, reproduce, and die. Each of these generations of butterflies lives for only two to five weeks. In the fall, the fourth generation of butterflies is born. Compared to its parents, this generation has a long life. It lives for about eight months. This generation of butterflies makes the amazing journey to the winter home of its great-great-grandparents. The butterflies spend the winter there, and in the spring they reproduce and then die. Their children will be the first generation of the next circle. How amazing it is!

1.From the passage we know that monarch butterflies ________.

A.spend their winter in North America

B.are small but can fly quite a long way

C.travel to central Mexico to reproduce

2.There are ________ mysteries about monarch butterflies’ journey.

A.two B.three C.four

3.The last paragraph is mainly about ________.

A.why Monarch butterflies fly from north to south

B.how Monarch butterflies make the amazing trip

C.when each generation of butterflies reproduce

4.According to the article, which of the following is NOT TRUE?

A.Two of the generations are born on the trip back to south.

B.Only the fourth generation can live through the whole winter.

C.The first generation of Monarchs is born in the south in spring.

5.We can read this passage on the ________ part of a magazine.

A.sports and health B.science and technology C.environment and nature

Millie wants to write about the rainforests. Davis, her Geography teacher, knows a lot about rainforests. So Millie is interviewing him to get some information.

Millie: Where are the rainforests?

Davis: Rainforests cover 6% of the Earth's surface. There are rainforests in many parts of the world but the biggest forests are in South America and South-east Asia (亚洲).There aren't any rainforests in Europe (欧洲) or North America.

Millie: What's in the rainforests?

Davis: About 75% of all the kinds of animals come from rainforests. Thousands and thousands of animals live in rainforests. There are many beautiful birds, insects and reptiles. There are also thousands of different plants! It is always hot in a rainforest and the ground is always wet. It’s also dark.

Millie: Why are the rainforests important?

Davis: The rainforests are very important for us. We need them! The trees and other plants in the forest help to make the air clean. They give us wood, rubber, fruits and many of our medicines.

Millie:______

Davis: Unfortunately, in many places, the rainforests are in danger. For example, many years ago there was a large rainforest in Java. There were thousands of different plants and animals in the forest, but now there is nothing. The same thing is happening now in many other parts of the world. The rainforests are in danger.

1.In which country can we find rainforests according to David's answer?

A.In the UK. B.In Canada. C.In the USA. D.In India.(印度)

2.Which of the following belongs to a kind of "reptile"?

A.A sparrow. B.A swallow. C.A snake. D.A butterfly.

3.Which might be Millie's fourth question?

A.What's happening to the rainforests?

B.What can we find in the rainforests in Java?

C.Why did people cut down the trees in the rainforests?

D.Why did many plants and animals disappear in the rainforests?

4.What can we learn from the interview?

A.We must learn how to survive in the rainforests.

B.More and more animals live in the rainforests now.

C.It is important to protect the rainforests.

D.It is always cold and wet in the rainforests.

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