Which is the biggest country in the world? Well, look at the map and you'll know it is Russia. It is followed by Canada, China, the U.S.A. and Brazil. Among them, China has the largest number of people, with a population(人口) of about 1.3 billion(十亿). Canada has the longest coastline(海岸线). The total length(长度) of the coastline is about 202,080 kilometers. It is long enough to go around the earth six times.

    Do you know which is the largest island(岛) in the world? Is that Hawaii? No, it is much smaller than the largest island in the world—Greenland. Greenland is to the northeast(东北) of Canada. Ice covers 81% of its land. It is very cold there, so there are only about 56,000 people living on the island.

it them about five hours to finish the work?

A：Hi, Mike! Can you tell me something about Siberian tigers?

B：Of course.

A：

B：They are big and strong. They have bright eyes, yellow fur(皮毛) and black stripes(条纹).

A：Can they climb trees?

B： But they can run very fast and are good at hunting(猎取) other animals.

A：How do they usually live?

B：They usually live as a family until the baby tigers are two or three years old.

A：

B：About two to four. They look lovely at birth.

A：So wonderful!

B：But the number of tigers is getting smaller and smaller.

A：What? How many Siberian tigers are there in the wild?

B： There are fewer and fewer Siberian tigers because people hunt them for their fur and bones.

A：Yes, I think so. Let's do something to protect Siberian tigers.

— _______ Only a few remain now.

— I _______ the flowers in my garden at that time.

— You are right.