Bài 5. Đọc và chọn câu trả lời đúng. A. Calories are units of energy. They refer to the amount of energy you get from foods and drinks, and the amount of energy you use through physical activities. For example, an apple has about 80 calories, while a 1.6 km walk might use up 100 calories. Calories are important for human health, and the key is having the right amount of it. B. Everyone needs different amounts of energy per day depending on age, size and activity levels. An athlete needs more calories than an office worker. To stay in shape, an average adult requires at least 1,800 calories per day (according to the Food and Agriculture Organization of the United Nations). If we eat just the number of calories our body needs each day, we will probably be healthy. However, eating too much can make you put on weight. To lose weight, eat fewer calories than your body burns each day. C. These are some experts' tips to reduce calorie intake. First, you must know how many calories you need each day and always count them in your diet. Have small frequent meals and drink more water too. This will help you feel less hungry. Furthermore, avoid all sugary drinks and junk food. They are high in energy but low in nutritional value. Question 30: What are calories? A. They are units of energy. B. They are the amount of energy. C. They are important. D. Each person needs different amounts of calories. Question 31: How many calories does an apple contain? A. 100 calories B. About 80 calories C. About 160 calories D. None are correct. Question 32: What factor decides the amount of energy a person needs each day? A. Age B. Size C. Activity levels D. All are correct. Question 33: What is a healthy number of calories per day? A. At least 160 calories B. About 80 calories C. At least 1,800 D. None are correct. Question 34: What happens when we eat too many calories? A. We can put on weight B. We will be healthy. C. We can lose weight. D. We can reduce calorie intake.

f(x)= 1/tan^4x +1/2-tan^4x. x ∈(0; π/4)

Câu 32:Phản ứng nào dưới đây là phản ứng hóa hợp? A. CaCO3 → CaO + CO2↑ B. Mg + H2SO4 → MgSO4 + H2↑ C. CaO + H2O → Ca(OH)2 D. CuO + H2 → Cu + H2O Câu33: Phản ứng nào sau đây không được dùng để điều chế hiđro trong phòng thí nghiệm A. Zn + 2HCl → ZnCl2 + H2. B. Fe + H2SO4 → FeSO4 + H2. C. 2Al + 3H2SO4 → Al2(SO4)3 + 3H2. D.2H2O ⎯⎯đp→ 2H2 + O2. Câu34: Cho nhôm (Al tác dụng với axit sunfuaric(H2SO4) thu được muối nhôm sunfat ( Al2(SO4)3) và khí H2. Phương trình phản ứng nào sau đây đã viết đúng? A. Al + H2SO4 -> Al2(SO4)3 + H2 B. 2Al + H2SO4 -> Al2(SO4)3 + H2 C. Al + 3H2SO4 -> Al2(SO4)3 + 3H2. D. 2Al + 3H2SO4 -> Al2(SO4)3 + 3H2 Câu 36: Số gam KMnO4 cần dùng để điều chế được 2,24 lít khí oxi (đktc) là: A. 20,7g B. 42,8g C. 14,3g D. 31,6 Câu 37: Khi hoà tan 10 ml rượu etylic vào 50ml nước thì: A. Rượu là chất tan và nước là dung môi. B. Nước là chất tan và rượu là dung môi. C. Nước và rượu đều là chất tan. D. Nước và rượu đều là dung môi.

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Bài 3: Chọn câu đúng. Question 12: A. I have stomach ache, so I don't want to eat anything. B. I have stomach ache, or I don't want to eat anything. Question 13: A. My mother eats a lot of fruit and vegetables, so she does exercise every morning. B. My mother eats a lot of fruit and vegetables, and she does exercise every morning. Question 14: A. My cousin, Trang is very fat, but she is too lazy to walk. B. My cousin, Trang is very fat, or she is too lazy to walk. Question 15: A. You can eat less, but you can do more exercise. B. You can eat less, or you can do more exercise. Question 16: A.I have flu, but I don't feel very tired. B.I have flu, so I don't feel very tired. Question 17: A.The Japanese eat a lot of fish, so they eat a lot of tofu, too. B.The Japanese eat a lot of fish, and they eat a lot of tofu, too. Question 18: A. The Americans often eat fast food, so many of them are overweight. B.The Americans often eat fast food, but many of them are overweight. Question 19: A.You can walk so you can ride a bike to get there. B.You can walk or you can ride a bike to get there. Bài 4. Chọn đáp án đúng để hoàn thành bài văn sau. We need calories or (20)…… to do the things every day. For example, when we walk to school or (21) ……a bike to school we spend a certain amount of (22)……… and even when we sleep, we also use them. But how many calories should we (23) ……… a day to stay in shape? It’s difficult (24)……… us to calculate. If people want to keep (25) ………they should remember that everyone should have between 1600 and 2500 calories a day. We get calories (26) ……the food we eat. If we get too many food and don’t take part (27)……… any activities, we can get fat quickly. So besides studying, we should do some (28)…….., play sports or do the housework, such as cleaning the floor, cooking etc. Otherwise, we don’t eat enough, we will be (29)……….and weak. Question 20: A. food B. energy C. drink Question 21: A. ride B. come C. drive Question 22: A. things B. food C. calories Question 23: A. do B. spend C. have Question 24: A. for B. with C. in Question 25: A. health B. fit C. active Question 26: A. in B. of C. from Question27: A. with B. in C. on Question 28: A. exercises B. activities C. healthy Question 29: A. good B. tired C. thirsty

Giả sử cái vương miện mà nhà vua Hêron trao cho Acsimet kiểm tra có klg 1.544kg. Và giả sử rằng khi nhúng trong nước trọng lượng của nó là 14.6N.Hãy tính khối lượng vàng mà thợ kim hoàn thay bằng bạc? Biết khối lượng riêng của vàng và bạc lần lượt là 19,39g/cm3 và 10,5g/cm3

Bài 1: Chọn từ khác loại. Question 1: A. cough B. weak C. headache D. sorethroat Question 2: A. sunburn B. toothache C. earache D. unhealthy Question 3: A. sick B. temperature C. tired D. weak Question 4: A. flu B. stomachache C. allergy D. fat Question 5: A. sleep B. happy C. live D. smile Bài 2: Chọn đáp án đúng để hoàn thành câu. Question 6: You should eat __fruits and vegetables because they are good for your health. A. more B. less C. little D. no Question 7: She looks very tired after coming back from work. She should rest _____. A. more B. less C. little D. no Question 8: We should spend ______time on computer games. A. more B. less C. little D. no Question 9: Drink ______ green tea and ______ coffee. A. more/less B. less /less C. little/more D. no/little Question 10: Smoking can lead to lung cancer, so smoke ______. A. more B. less C. little D. no Question 11: _______ vegetables everyday is important. A. eat B. to eat C. eating D. eats

(x-1)^2 =1-x làm mình với đang học zoom

Giúp mình đề là nhân đa thức thành nhân tử