Rice is a kind of grass. There are more than seven kinds of rice. Most kinds are water plants. Farmers grow rice in many countries, even in the southern part of the United States and Eastern Australia. No one really knows where rice came from. Some scientists think it started to grow in two places. They think that one kind of rice grew in Southern Asia thousands of years ago. Someone in China wrote about it almost five thousand years ago. Another kind probably grew in West Africa. Other scientists think rice came from India, and Indian travelers took it to other parts of the world. 19. There are only three kinds of rice. ______ 20. They grew rice in Southern Asia hundreds of years ago. ______ 21. Nobody knows where rice came from. ______ 22. According to the passage, Indian travelers took maize to other parts of the world. ______ Read the passage again and choose the best answer ( A, B, C or D) (0.5pt) 23. What’s the passage mainly about? A. Kinds of rice and their origins. B. Growing rice in the USA and Eastern Australia C. Growing rice in Southern Asia. D. Growing rice in India. 24. What can be inferred from the passage? A. Rice is grown everywhere. B. Some kinds of rice are water plants. C. There are seven kinds of rice. D. Rice is grown in Southern Asia many centuries ago

cho a^2+b^2+C^2=ab+bc+ca. Chứng minh a=b=c

chon 4 chat ran khac nhau de khi phan ung voi 0,1 mol H2SO4 thi deu tao ra khi SO2 va lan luot co so mol là : 0,01 ; 0,05 ; 0,15 ; 0,2

Bài 1: Một người đi xe máy từ A đến B với vận tốc 45km/giờ. Cùng lúc đó một ô tô đi từ B đến A với vận tốc 60km/giờ. Hỏi sau mấy giờ ô tô và xe máy gặp nhau, biết quãng đường AB dài 252km.

Giúp mình vs ạ. Mình đang rất gấp. Mình hứa sẽ tym và vote 5* đầy đủ ạ

Làm những phần mk tô xanh ạ

33. She turned on the lights all day. Therefore, she paid a lot of money.  As she____________ 34. I think we should make posters on energy saving and hang them around our school. I suggest posters 35. The weather will be fine today. Our family will have a picnic outside.  If _________ 36. John spends most of his free time participating in social activities.  John spent _________

Nhớ giúp mình nha. mình vote 5 sao và tlhn

Kể LẠI TRUYỆN THÁNH GIÓNG BẰNG LỜI KỂ CỦA THÁNH GIÓNG giúp mình nhanh lên với

hòa tan hoàn toàn 14g kim loại A vừa đủ dd H2SO4 24,5% thu được dd B và 5,6l khí H2