Vào mùa hanh khô, nhiều khi kéo áo len qua đầu, ta thấy có tiếng nỏ lách tách. Đó là do?

A. hiện tượng nhiễm điện do tiếp xúc.

B. hiện tượng nhiễm điện do cọ xát.

C. hiện tượng nhiễm điện do hưởng ứng.

D. cả ba hiện tượng nhiễm điện nêu trên.

Hạt nhân nào dưới đây không chứa nơtron ?

A. Triti

B. Hidro thường

C. Đơteri

D. Heli

Read the passage below and decide whether the statements are TRUE or FALSE?

Now Thu lives with her family in a beautiful house on Tran Hung Dao street. Every morning, Thu gets up at six. She has big breakfast at 6.10. After breakfast, she brushes her teeth. She goes to school at 6.30. She has lunch at 11.30 at school. In the evening, sometimes she has lessons, sometimes she plays volleyball or soccer with some friends of her. She comes back home at about 5:00 and helps her mother to cook dinner for her family.

She doesn’t like outdoor activities.

A. True

B. False

C nhé

Đồ thị hàm số y = x + 1 x 2 - 1  có tất cả bao nhiêu tiệm cận đứng và tiệm cận ngang? 

A. 4

B. 2

C. 1

D. 3

1. Children are looked after by their parents.

2. A strange man was seen last night.

3. Potatoes are eaten every day.

4. The floor is cleaned every morning.

5. The problem can be solved soon.

6. The homework is being done.

7. A book was being written on biology.

8. A film was being watched.

9. A new hospital near the airport have been built.

10. I will be collected at the airport.

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