1)        university             pollute                popular                  reuse

2)        dance                    have                    match                    had

3)        hi - tech                wireless               fridge                    environment 

4)        charity                  skyscraper           fly                         recycle

There are (0) five different types of rhino in the world today. The Black and White Rhino live in the (1) open fields of Africa. The others live in the forest in Asia.
All rhino have big, heavy bodies. Their skin is very hard and they have very little (2) hair. The great body of (3) the rhino stands on (4) four short legs. Each foot has (5) three toes. They usually walk very slowly (6), but they can run at 50 kilometers an(7) hour. Rhinos are usually quiet and calm animals, and they only eat (8) grass and other plants.
A baby rhino weighs 40 kilos when it is born. It has been inside its (9) mother for about fifteen months. And adult rhino weighs over 200 kilos and may live (10) to be 50 year old.

Chiều cao của hình thang là:

40.2 : 5 = 16 (cm)

Diện tích hình thang là:

(27 + 48) .16 : 2 = 600 (cm²) 

Đáp số: 600 cm²

1 - i

2 - g

3 - b

4 - f, h, j

5 - c, d

6 - a, e