Nhận biết bột đá vôi CaCO3 và Na2CO3

I . Chọn câu trả lời đúng,bằng cách chọn A,B,C hoặc D: 1. Nam______English on Monday and Friday. A. not have B. isn’t have C. don’t have D. doesn’t have 2. We go to school at ______ in the morning. A. a quarter to seven B. seven to a quarter B. C. seven quarter D. a quarter seven to 3. Do children have math on Monday ? -………………. A. Yes, they have B. No, they don’t C. Yes, they don’t D. No, they not have 4. Mr. Nam gets up at 7.00 and eats ______ A. a big breakfast B. the big breakfast C. big breakfast D. a breakfast big 5. Is her school ______the park ? A. in front of B. next C. in front to D. near to 6. Is this her______? A. erasers B. books C. an eraser D. eraser 7. Tan likes ______ weather because he can go swimming. A. hot B. cold C. windy D. foggy 8. ______straight across the road. A. Don’t run B. Not run C. No run D. Can’t run 9. I hope the ______ can repair our car quickly. A. mechanic B. reporter C. architect D. dentist 10. The Bakers ______ dinner at the moment. A. is having B. are having C. eating D. is eating II. Chia đúng động từ trong ngoặc: 1. My brother ( not live)………………… in Hanoi. He(live)…………. in Ho Chi Minh City. 2. Our school ( have)…………….. a small garden. There ( be)………………… many flowers in it. 3. What time ………….your son ( get up)……………. every morning ? 4. ……………….Your parents ( go )……………. to work every day ? 5. Nam ( wash)………………… his face at 6.15. 6. We ( not have)……………………. breakfast at 6.30 every morning. 7. She can (speak)............. English. 8. ……………..He (eat) ............... a lot of meat? 9. Where…………….. Mai (be) ........... now? She (play) ......................... in the garden. 10. Look! She (come)................................ 11. What …………..(be) there (drink) ............for dinner? III. Đọc đoạn văn,chọn đáp án thích hợp nhất bên dưới: I live in a house near the sea. It is ...(1)... old house, about 100 years old and...(2)... very small. There are two bed rooms upstairs...(3)... no bathroom. The bathroom is down stairs ... (4)... the kitchen and there is a living room where there is a lovely old fire place. There is a garden...(5)... the house. The garden...(6)... down to the beach and in spring and summer...(7)... flowers every where. I like alone...(8)... my dog, Rack, but we have a lot of visitors. My city friends often stay with...(9)... I love my house for... (10)... reasons: the garden, the flowers in summer, the fee in winter, but the best thing is the view from my bedroom window. 1. A. a B. an C. the D. any 2. A. It's B. It C. there's D. They're 3. A. and B. or C. but D. too 4. A. between B. next C. near to D. next to 5. A. in front B. front of C. of front in D. in front of 6. A. go B. going C. goes D. in goes 7. A. these are B. they are C. there are D. those are 8. A. for B. of C. on D. with 9. A. me B. I C. my D. I'm 10. A. a B. any C. many D. a lot IV. Tìm và sửa lỗi các câu trong đoạn văn sau: Miss Lien live in a small house on Hanoi. ………………………………………………………. She teaches English at a school there. ……………………………………………………… She usually is breakfast in seven in the morning and she has dinner at twelve o'clock in the canteen of the school. ……………………………………………… She teaches his students in the morning. ………………………………………………………………………. She teaches them dialogues on Wednesdays to Fridays. …………………………………………………………………………….. On Mondays, she teach them grammar. ………………………………………………………………………………… On the evening, she usually stays at home and listens books. …………………………………………………………………………………………. She sometimes goes to the movie theatre. She always go to bed at ten o'clock. …………………………………………………………………………………………………… V. Viết câu thứ hai,sao cho có nghĩa không đổi với câu thứ nhất: 1. Does Phong’s school have forty classrooms ? → Are …………………………………………………………... 2. Phuong has a brother, Nam. →Phuong is …………………………………………….……… 3. My father usually drives to work. →My father usually goes ………………………………….… 4. This house is small. → It is ............................................................................................ 5. The bookstore is to the right of the toystore. → The toystore .............................................................................

bộ nst lưỡng bội của loài 2n=8.Từ 1tb của loài đã trải qua nguyên phân 1 số đợt đã hình thành các tb con.Những tb con này tiếp tục nguyên phân 1 lần nữa vào kì giữa của quá trình nguyên phân.Người ta đếm được trong nhóm tế bào trên có 512 cromatit .Nhóm tb trên đang thực hiện lần nguyên phân thứ mấy .

Có ai rảnh để giúp tui hong...?:^? Tui cảm ơn nhiều!!!:D

Giúp mil với mik đang cần gấp mik cảm ơn

Giúp em với ạ em đang cần gấp gấp ạ...!

I.Viết lại câu 1.My mother usually feeds the dog ->The dog 2.The little girl has eaten the eggs ->the eggs 3.people play soccer all over the world ->Soccer 4.the postman brought the mail early today ->The mail 5.Alex wasn't singing a song when the doorbell rang ->A song

AP had difficulties in early 2005, when 17 staff members on General Mills accounts left đặt câu hỏi cho phần gạch chân " 17 staff members on General Mills accounts left "

Giúp e bài này nha HSG, CHuyên gia Cho m,n thuộc Z+ thỏa mãn $\sqrt{23}$ -$\frac{m}{n}$ >0 CMR $\sqrt{23}$ -$\frac{m}{n}$ >$\frac{4(\sqrt{23}-4)}{mn}$

Hộ mình với. ~~~~~~~~~~~~~~~~~~~~~~~~~~