Cho 2 tập hợp A=(m-3;m+4] và B=(-3;5] với m thuộc R.Xác định m để A là con của B
Put the verbs in correct form 1. Listen! My mother (sing)_ a song. 2. Every night, We (go). bed at 10p.m 3. She (like). Music but I (like). Math 4. My father (read)a newspaper in the morning 5. Look! The bany (run) 6. My sister usually (listen) to music before going to bed. 7. Where (be)_your father? 8. This T-shirt looks nice. I (buy)it. 9. Look at the dark clouds. It (rain). soon. 10. I'm sure you (pass)_ the exam. Don't worry.
PART 2: Rewrite the following sentences without changing their meaning, using the given words. Question 1. We wanted to get good seats, so we arrived early. In order........ Question 2. They will build a hotel in this town next year. The hotel........ Question 3: The students clean the classroom after school. The classroom_....... Question 4: They will build a new bridge next year. A new bridge....... Question 5: My brother is cooking dinner in the kitchen now. Dinner......... Giúp vs ạ
PART 1. Choose the underlined word or phrase - A, B, C or D- the needs correcting. Question 1: What do you doing at the moment? Question 2: The children are want to have a rest now. Question 3: Sometimes my dad cook a good meal for the whole family. Question 4: A new school is going to be build in my village next year. Question 5: This kind of bird found in remote places in Scotland. Question 7: People should avoid using products which make from plastic. Question 8: Students were introduct on how to recycle the used items in their homes. Question 9: Look at those black clouds. It will rain. Question 10: I think people are live on Mars someday. Question 11: Tom watches usually television in the evening. Question 12: I spend 20 minutes to read books everyday. Question 13. Don't forget calling me as soon as you arrive here. Question 14. You'd better not spend too much money on shopping, and you won't have any left. Question 15: We plan buying a new house this summer. Giúp mình với
Câu 1. Trong nhóm các oxit: CO2, NO2 , CaO, FeO, Fe2O3, SO2 có:
A. 3 oxit axit, 3 oxit bazơ.B. 2 oxit axit, 4 oxit bazơ.
C. 4 oxit axit, 2 oxit bazơ.D. 1 oxit axit, 5 oxit bazơ.
Câu 2. Phản ứng nào dưới dây là phản ứng phân hủy ?
A. CuO + H2
B. CaO + H2O
C.
D. CO2 + Ca (OH)2
Câu 3. Trộn lẫn các dung dịch sau, trường hợp không xảy ra phản ứng là
A. MgCl2 và NaOHB. Mg(NO3)2 và K2SO4
C. H2SO4 và Ba(NO3)2D. CaCO3 và HCl
Câu 4. Cho phản ứng : C + O2. Phản ứng trên là
A. phản ứng hóa học. C. phản ứng hóa hợp.
B. phản ứng phân hủy. D. phản ứng thế.
Câu 5. Phản ứng nào dưới dây là phản ứng thế?
A. CuO + H2
B. CaO + H2O
C.
D. Zn + HCl
Câu 6. Khi hòa tan Na2SO4 vào nước thì
A. Na2SO4 là dung môi. B. Nước là dung dịch.
C. Nước là chất tan. D. Na2SO4 là chất tan.
Câu 7. Hòa tan hoàn toàn 50gam muối ăn (NaCl) vào 200g nước ta thu được dung dịch có nồng độ là?
A. 15% B. 20% C. 25% D. 28%
Câu 8. Hoà tan 20g muối ăn (NaCl) vào 80g nước thu được dung dịch có nồng độ ?
A. 20% B. 25% C. 10% D. 15%