mn giúp tui nha tui choa mn 30 điểm lun :V

Nối vào với nhau náh các bạn giúp mik nối nhá A B 1. If people keep dumping rubbish into the lake, a. the groundwater will be poisoned. 2. If the farmers overuse pesticide, b. if our surrounding environment is polluted 3. Soil erosion won’t happen in an area, c. they will disappear in the future. 4. if we don’t converse the rainforests, d. unless we join hands to protect it. 5. Our health will be badly affected e. the aquatic life will be afflicted. 6. Our environment will be damaged f. floods will be more and more severe. 7. Is we don’t protect the frontier forests, g. if people use more public transportation. 8. The amount of carbon dioxide in the atmosphere will be reduced

Cho ΔABC có ba góc nhọn nội tiếp đường tròn (O). Gọi M là điểm bất kì trên cung nhỏ AC. Gọi E,F lần lượt là chân đường vuông góc kẻ từ M đến BC và AC. P là trung điểm của AB; Q là trung điểm của FE. Chứng minh: 1) MFEC nội tiếp 2) BM.EF = BA.EM 3) Δ AMP ≈ Δ FMQ 4) Góc PQM = 90°

pls làm hộ mik với pls pls 1 bài thôi I/ Complete the sentences with the correct form of the words in brackets: 1.Carnival is a popular ________ in many countries in South Amaerica. (festive) 2.It usually happens in February, and South American people ______ it in different ways. (celebration) 3.The Rio Carnival is the biggest and most famous, with most lively _________ (celebrate) 4.It gives people a chance to learn about the true _______ of Brazil. (cultural) 5.People wear costumes and ______ through the streets, playing samba music and dancing. (parade) 6.The highlight of the Rio Carnival is the Samba Parade with thousands of samba _________ from various samba schools. (perform) 7.A lot of ________and _______ activities are held as part of the Flower Festival in Dalat. (culture/ artist) 8.There is a special __________ for Japanese girls on March 3rd every year. (celebrate) 9.I saw a parade of flower floats when I ______the festival last year. (attend) 10.I love the _________ of folk songs. (performer) 11.We had a ________ meal on my grandfather’s birthday. (celebrate) 12.The christmas season is also called the ______ season. (festival) 13.Villages _______ contribute money and other things to celebrate the festival .(volunteer) 14.The _______ atmosphere is felt around all the villages. (festival) 15.There are some other activities such as ______ shows,buffalo races, and _____ games. (culture/ tradition) 16. La Tomatina is a _______ festival to celebrate the tomato harvest. (season) 17.Halloween is a _______ festival. People often put pumpkin lanternsoutside their house. (religion) 18._______ energy is renewable. Moreover it is clean and safe. (sun) 19.Biogas is mainly used for ______ and _______ (cook/ hot) 20.People in ______ are have to gather wood to use as fuel. (mountain) 21.Biogas helps solve the problem of indoor air _________ (pollute) 22.In the future, the wind and the sun will be used as the main _________ friendly energy sources. (environment) 23.many poor people in developind countries have little _______. (electric) 24._________,fossil fuels are harmful to the environment. (fortunate) 25. We are looing for cheap, clean and ________ sources of energy. (effect) 26. We shouldn’t waste ________ resources. (nature)

30. for / How often / are you / late / school? ..................................................................................................................................... 31. in her / shopping / often goes / free time. / My mother ..................................................................................................................................... 32. years? / you begin / school / When do / the new ..................................................................................................................................... 33. wear / in the winter. / clothes / warm / We always ..................................................................................................................................... 34. uncle plant / garden?/ many flowers / Does your / in the ………………………………………………………………………………………. 35. can you / for me? / go to the / supermarket to / buy some fruit / ..................................................................................................................................... 36. music / to /you listen / last night? / Did/ ..................................................................................................................................… 37. a year. / always / a picnic twice / My classmates / have / ..................................................................................................................................... 38. no / There are /in / girls / his class./ ..................................................................................................................................... 39. to work / Many people /for their / walk / health. ..................................................................................................................................... 40. her / are / hats. / new / Those

Cho hình lăng trụ đều ABC.A'B'C' có M,N lần lượt là trung điểm của BC ,A'C' .Xác định hình dạng của thiết diện của hình lăng trụ với mp (a) biết (a) chứa MN và vuông góc với (ABB'A')

Tại sao NST pải co xoắn tối đa trước khi bước vào kì sau

Bài 2: Cho , trong đó AB = 6cm, góc B bằng 70 0 , BC = 9cm. Em có thể suy ra số đo các cạnh nào, góc nào của ? Bài 3: Cho tam giác ABC cân tại A, Kẻ BD vuông góc với AC, CE vuông góc với AB. BD và CE cắt nhau tại I.

2, this is Jack l stayed during the summer with him 3, helen is the girl l have talked to you about her 4, the music sounds really interesting you are listening to ít 5, l'm waiting for the bus l go to work on it 6, that is the house lived in it when l was young 7, the man is called Eric She works for him 8, the boy is very nice l go to school with him 9, l don't like people who arrive late 10, l live in a house which was built a century ago 11, the people who work here are very interesting 12, the handkerchief which was embroidered by my sister was really beautiful 13, l want to meet the woman who taught me how to drive 14, the cake which was made by mother was very delicious 15, this Morning l received a letter which upset me a lot Giải giúp mk vs ạ

1, Cho a gam hỗn hợp X (gồm Na và Mg) vào một lượng nước dư thì thu được b lít khí. Cho 2a gam X vào dung dịch HCl dư thì thu được 4b lít khí. Tính thành phần % về khối lượng của Na trong X . Biết các khí đo ở cùng điều kiện nhiệt độ và áp suất 2 ,Hỗn hợp A gồm CO và không khí (có 1/5 thể tích là O2 và 4/5 thể tích là Na2) có tỉ khối so với khí heli là 7,12. Tính thành phần % theo thể tích 3 khí trong hỗn hợp.