Xương hóa thạch của loài vượn cổ xuất hiện khoảng 6 triệu năm trước đây được tìm thấy ở đâu? A. Đông Phi, Tây Á, Bắc Á B. Đông Phi, Tây Á, Việt Nam C. Đông Phi, Việt Nam, Trung Quốc. D. Tây Á, Trung Á, Bắc Mĩ.

Cảm nhận vẻ đẹp muôn màu của ánh trăng trong bài ngắm trăng của Hồ Chí Minh

1. No one is better at English than Lan,_________? A. is she B. isn't she C. are they D. aren't they 2. There are a lot of people attending the wedding party, _______? A. are they B. are there C. aren't they D. aren't there 3. He seldom goes to the park,__________? A. doesn't he B. is he C. does he D. isn't he 4. Let's go for walk,__________? A. will we B. shall we C. don't you D. do you 5. I think he will come here,________? A. doesn't he B. won't he C. will he D. don't I 6. The film is boring, ________? A. is it B. are they C. isn't it D. aren't they 7. You are listening to music,_________? A. is you B. are you C. aren't you D. were you 8. He can speak English,__________? A. can he B. can't he C. can't him D. could he 9. You don't know her,__________? A. do you B. don't you C. are you D. aren't you 10 Nga speaks English very well,_________? A. does she B. doesn't she C. is she D. was she 11. John has bought a dictionary,__________? A. does he B. did he C. has he D. hasn't he 12. They met him at the party last night,__________? A. do they B. don't they C. did they D. didn't they 13. They are going to do the test tomorrow,__________? A. do they B. are they C. aren't they D. did they 14. I'm short,__________? A. am not I B. aren't you C. are you D. aren't I 15. No one is in this room now,__________? A. is one B. isn't one C. is he D. are they 16. Somebody has stolen your bag,________? A. have they B. haven't they C. has he D. hasn't he 17. James often goes swimming in the summer,_________? A. does he B. is he C. doesn't he D. didn't he 18. You aren't doing your homework________? A. are you B. have you C. aren't you D. do you 19. This ticket doesn't cost a lot,__________? A. do they B. does it C. is it D. isn't it 20. You don't love me anymore,__________? A. do I B. don't I C. do you D. don't you 21. Nobody knows the truth,__________? A. do they B. don't they C. does it D. doesn't it 22. Nam was playing football,__________? A. was Nam B. wasn't he C. was he D. didn't he 23. You'll be at home tonight,_________? A. will you B. won't you C. are you D. won't you be 24. David is talking to his friend,_________? A. is he B. isn't he C. is David D. isn't David 25. Don't leave here,__________? A. do you B. don't you C. will you D. shall we 26. She thinks they will come,__________? A. does she B. doesn't she C. won't they D. will they 27. There is nothing to eat,_________? A. isn't there B. aren't they C. are they D. is there 28. The children can read the story, __________? A. can't they B. can they C. they can D. they can't 29. My brother shouldn't do that_________? A. should he B. are he C. shouldn't he D. aren't he 30. Lan never goes out at night_________? A. doesn't she B. does she C. isn't she D. is she

0.25 mol sắt oxit chứa 7,5.10^23 nguyên tử sắt và oxi. Hãy tìm công thức sắt oxit. HELP ME

Giúp mik với mik đang cần gấp .

Giải hộ mình mấy câu trắc nghiệm này với

Nhanh nha, mình đang cần gấp lắm

Giúp mik với mik đang cần gấp .

Hỗn hợp X gồm Fe, FeO và Fe2O3. Cho một luồng CO đi qua ống sứ đựng m gam hỗn hợp X nung nóng. Sau khi kết thúc thí nghiệm thu được 64 gam chất rắn A trong ống sứ và 11,2 lít khí B (đktc) có tỉ khối so với H2 là 20,4. Tính giá trị m. A. 105,6 gam. B. 35,2 gam. C. 70,4 gam. D. 140,8 gam.

Hai xe cùng chở một số quả dứa như nhau để bán. Cuối ngày, xe thứ nhất bán được 106 quả dứa. Xe thứ hai bán được 70 quả dứa. Khi đó, số dứa của xe thứ hai bằng 9/5 số dứa của xe thứ nhất. Hỏi xe thứ nhất và xe thứ hai còn lần lượt bao nhiêu quả dứa? Nhanh nhưng vẫn phải dễ hiểu nha mn