Bài 2.

Sau khi kiểm tra sức khoẻ, cô giáo chủ nhiệm yêu cầu mỗi học sinh của lớp 6A thống kê cân nặng của các bạn trong cùng tổ, Bạn An liệt kê số cân nặng (theo đơn vị kg) của các bạn trong cùng tổ như sau: 35; 40; 40; 42; 144; 45; 40; 39; 35; 41.

a) Hãy nêu đối tượng thống kê và tiêu chí thống kê.

b) Dãy số bạn An liệt kê có hợp lí không? Vì sao?

c) Cân nặng trung bình của ba bạn nhẹ nhất trong tổ bạn An là bao nhiêu?

 IV.Choose the correct answer from the four options marked A,B,C or D to complete each of the numbered blanks in the following passage.

WHY DO ANIMALS GO EXTINCT?

Different kinds (18)…………animals have appeared and disappeared throughout Earth’s history. Some animals go extinct (19)………the climate where they live changes. The climate may become wetter or drier. It may become warmer or cooler. If the animals cannot change, or (20) ……… to the new climate, they die.Some animals go extinct because they cannot (21)………. with other animals for food. Some animals go extinct because they are killed by enemies. New kinds of animals are always evolving. Evolving(22)……..that the animals are changing slowly from generation (23)…………generation. Small differences between parents,children, (24)……… grandchildren slowly add up over many, many generations. Eventually,a different kind of animal evolves. Sometimes, many of the animals on Earth go extinct at the (25)………time. Scientists call this a mass extinction. Scientists think there have been at least five mass extinctions in Earth’s history. The (26)………mass extinction happened about 65 million years ago. This mass extinction killed off

IV. Decide whether the verbs in these sentences are right or wrong. Correct those which are wrong(Tìm lỗi sai ở dộn từ và sửa lại nếu sai)

1) Look! Somebody is climbing up that tree over there.

2) Can you hear those people? What do they talk about?

3) Are you believe in God?

4) Look! That man tries to open the door of your car.

5) The moon goes round the earth.

6) I’m thinking it would be a good idea to leave early.

7) The government is worried because the number of people without jobs is increasing.

8) I’m usually going to work by car.

9) I don’t know your telephone number.

10) Please don’t make so much noise. I study.

11) Sue and Alan are married since July.

12) It is raining all day.

13) She has been ill for a long time.

14) Have you always been living in this house?

15) How long has Jack been unemployed?