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1 phương trình mp trung trực của đoạn thẳng AB với 2 điểm A(3;1;2), B(-1;-1;8) là 2 cho tứ diện ABCD có cạnh AB, BC,BD vuông góc với nhau từng đôi một. Khẳng định nào sau đây đúng? A góc giữa CD và (ABD) Là góc CBD B góc giữa AD vÀ (ABC) là góc ADB C góc giữa AC và (BCD) là góc ACB D góc giữa AC và (ABD) là góc CBA 3 Trong ko gian Oxyz. Gọi E (a;b;c) là trọng tâm tam giác ABC với A(1;2;3), B(1;3;4), C(1;4;5) . Gía trị của tổng a^2+b^2+c^2 là 4 Mặt phẳng đi qua hình trụ, cắt hình trụ theo thiết diện là hình vuông có cạnh bằng 2R . Diện tích toàn phần của khối trụ bằng 5 Trong ko gian Oxyz, pt chính tắc của đường thẳng đi qua hai điểm A(1;2;-3) VÀ B (3;-1;1) là 6 Cho cấp số nhân (un), biết u1=-2, u2=8. công bội q của cấp số nhân đã cho bằng 7 Một tổ học sinh có 5 nam và 5 nữ xếp thành một hàng dọc thì số các cách xếp khác nhau là 8 Bán kính đáy hình trụ bằng 4cm, chiều cao =6cm. Dộ dài đường chéo của thiết diện qua trục bằng 9 số giao điểm của đồ thị hàm số y= x^4+x^2-2020 và trục hoành là 10 cho hình phẳng giới hạn bởi đồb thị hàm số y=e^x , trục Ox và hai đường thẳng x=0,x=1. Thể tích khối tròn xoay tạo thành khi quay hình phẳng đó quanh trục Ox , dc cho công bởi công thức là
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PART B: VOCABULARY AND GRAMMAR I. Choose the best answer (A, B, C or D) to complete these sentences. (2.0pts) 1. Many students …………….. aerobics to keep fit. A. have B. go C. play D. do 2. We will have a …………….. to take care of our health. A. home robot B. doctor robot C. teaching robot D. worker robot 3. In the future , I will live ………………….because I like swimming. A. in the mountain B. on the Moon C. on the ocean D. under the ground 4. My future house will have a hi-tech robot to ……………………..the floors. A. clean B. cleaning C. cleaned D to clean 5. We might have a ……………………. TV so we can watch TV programmes from space. A. wire B. wireless C. wiring D . wires 6. Hoa has never ……………………… to London . A. been B. is C. was D. be 7. If we throw trash on the road, we will_________our environment. A. pollution B. pollute C. polluting D. to pollute 8. They couldn’t go on a picnic ______________the weather was bad. A. because B. when C. but D. Or II. Put the verbs in brackets in the correct tense form.(1.0 pt) 1. School (finish) ......... at 4.30 p.m every day. 2. Listen! ......... they (sing) ......... in the classroom? 3. ......... you often (eat) ......... lunch in the school canteen? 4. We ( visit ) ………… Ngoc Son Temple many times. PART C: READING I. Read, then complete the passage. Use the words provided (1.25 pts) farm - country - morning - with - does - sometimes Hoa’s family live in the (1)__________ . Her father is a farmer. He grows rice, vegetable, and raises cattle, such as cows, buffalo and pigs. Her mother is a homemaker. She (2)_________ the housework, takes care of the family and (3)__________ helps on the farm. Both her father and mother are busy from (4)__________ till night. In her free time, Hoa helps her parents with the chores around the house. She loves farm work, too. Life on a (5)_________ is hard and busy, but in return, they enjoys fresh air and the quiet of the country. II. Read the passage and then choose the best answer. (1.25 pts) A robot cannot think or do things alone. People use a computer to control it. Today, robots are not very popular because they are too expensive, but they are very useful. They can help us save a lot of time and work. A robot can do the same work for 24 hours, and yet, it does not complain or get tired. In the US, people use robots to guard some important places. These robots can listen to certain noises and send signals for help if there’s trouble or danger. In Japan, people use robots in factories to build cars. In the future, scientists will design many types of intelligent robots. Their robots will be able to do many more complicated things. However, some people do not like robots. They fear that one day robots will be too powerful. 1. Why do people use a computer to control a robot? A. Because it can save time and work. B. Because it cannot think or do things alone. C. Because it is too expensive. D. Because it is very useful. 2. Which of the following statements is NOT TRUE according to the text? A. People use computers to control robots. B. Robots cannot do the same work for 24 hours. C. Robots do not get tired of working. D. People use robots to guard some important places in the US. 3. A. a robot B. a computer C. work D. the US 4. In Japan, people use robots in factories to __________. A. guard important places B. do many more complicated things C. build cars D. listen to certain noises 5. Some people fear that one day robots __________. A. will be busier than humans B. will be able to do complicated things C. will have too much power D. will make too much noise PART D: WRITTING I. Arrange the words to make the correct sentences (0.5 pts) 1. Ocean / the/ my/ on / be/ house/ will/future/. =>………………………………………………………………………………………………… 2. If/ polluted/ the/ will/ soil/the/plants/ die/is/. =>………………………………………………………………………………………………… II. Rewrite these sentences as directed in the brackets. (1.5 pts) 1. He was lazy, so he got a bad mark. (Rewrite this sentence with “because”) =>………………………………………………………………………………………………… 2. It rained hard yesterday. I went to school on time. (Combine these sentences with “although”) =>………………………………………………………………………………………………… 3. We make the air dirty because we use the car all the time. (Rewrite this sentence with “If”) =>…………………………………………………………………………………………………

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