John wrote a 4-digit number on a piece of paper and asked Peter to guess it. Peter asked: “Is the number 2435?” John replied: “Two of the digits are correct. The positions of those digits are also correct.” Peter asked again: “Is the number 6397?” John replied: “Two of the digits are correct. The positions of those digits are all wrong.” Peter asked again: “Is the number 9823?” John said: “All the digits are correct. The positions of those digits are all wrong.” Given all the digits in that 4-digit number are all different, what is the number written by John?

Giúp mình câu 12 với, cho mình xin cách giải chi tiết luôn

Câu 1 : Electron tự do là gì? - Bên trong kim loại tồn tại các hạt ................. tách ra khỏi nguyên tử gọi là các hạt ................. tự do. Câu 2: Dòng điện ? Dòng điện từ dòng điện trong kim loại là gì ? - Dòng điện là dòng dịch chuyển ........................... của các điện tích - Dòng điện trong kim loại là dòng............................ của các ......................... tự do Cau 3: Phân biệt chất dẫn điện và chất cách điện:

mn vẽ giùm mk hình nền gil xô đc ko ạ ! thanks nha !

Hai đoạn thẳng AC và BD cắt nhau tại trungđiểm O của mỗi đoạn. Chứng Minh: a) AD=BC, AB=DC b) CDA=CBA, BAD=BC Làm ơn. Xin hãy giúp mình. Cảm ơn rất nhiều!

VIII. Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks. BEFORE THE INTERVIEW You should find out as much as possible about the job and the (23) ___________.Before the interview, you have to send a letter of application and your resumes to the company to express your interest in the job and (24) ___________that you may be the most suitable candidate for the position. When you come to the interview, remember (25) ___________ with you your school certificates and letter of recommendation from your teachers or your previous employers. (26) ___________ you may jot down your qualifications and experience that can relate to the job and prepare for the questions that are often asked during the interview. Make sure you know where the interview is and (27) ___________ there. Be on time or a few minutes early. Don't forget to dress neatly and formally. 23. A. vacancy B. career C. profession D. place 24. A. showing B. to show C. shown D. show 25. A. to bring B. bringing C. brought D. bring 26. A. Although B. In addition C. However D. And 27. A. how to get B. how getting C. way getting D. to get IX. Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions. Orbis is an organisation which helps blind people of everywhere. It has built an eye hospital inside an aeroplane and flown in all over the world with an international medical team. Samantha Graham, a fourteen- year- old schoolgirl from England, went with the plane to Mongolia. Samantha tells the story of the Eukhtuul, a young Mongolian girl. "Last year, when Eukhtuul was walking home school, she was attacked by boys I with sticks and her eyes were badly damaged. Dr. Duffey, an Orbis doctor, said that I without an operation she would never see again. I thought about all the things I do I that she couldn't, things like reading schoolbooks, watching television, seeing friends,! and I realised how lucky I am." "The Orbis team agreed to operate on Eukhtuul and I was allowed to watch, together with some Mongolian medical student, I prayed the operation would be successful. The next day I waited nervously with Eukhtuul while Dr. Duffey removed her bandagers. "In six months your sight will be back to normal," he said. Eukhtuul smiled, her mother cried, and I had to wipe away some tears, too!" "Now Eukhtuul wants to study hard to become a doctor. Her whole future has changed, thanks to a simple operation. We should all think more about how much our sight means to us." 28. What information can be learned from this passage? A. the best way of studying medicine B. the international work of some eye doctors C. the difficulties for blind travelers D. the life of schoolchildren in Mongolia 29. The word "she" in the passage refers to____________. A. the writer B. the nurse C. Eukhtuul D. the medical student 30. After meeting Eukhtuul, Samantha felt ____________. A. angry about Eukhtuul's experience B. grateful for her own sight C. proud of the C. doctor's skill D. surprised by Eukhtuul's ability 31. What the result of Eukhtuul's operation ? A. After some time she will see an well as before B. Before she recovers, she needs another operation C. She can see better but can never have normal eyes D. She can't see perfectly again 32. What is the writer's main purpose in writing this passage? A. To describe a dangerous trip B. To explain how sight can be lost C. To report a patient's cure D. To warn against playing with sticks

Mọi người giúp mình với ạ Hứa cho 5 sao

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlinedword(s) in each of the following questions from 19 to 20. Question 19: The Yugo was considered one of the safest and most dependable cars on the road in Slovakia, until people started importing cars from abroad. A. swift B.enjoyable C. reliable D. exciting Question 20: He was able to incorporate a multimedia slideshow into the lesson plan despite the school’s lack of equipment because his friend lent him a multimedia projector. A. propose B.determine C. bestow D. include Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlinedword(s) in each of the following questions from 21 to 22. Question 21: Travel insurance is sometimes mistaken for temporary health insurance, but the two are actually different. A. transitory B. passing C. mutable D. permanent Question 22: Although they hold similar political views, their religious beliefs present a striking contrast. A. interesting resemblance B. complete coincidence B. significant difference D. minor comparison

Tại sao khi sống ở miền hạnh phúc nhân vật tôi lại cảm thấy tẻ ngắt Đọc hiểu "miền hạnh phúc " trích : " tạn cùng nơi lối đi này "

hợp chất của nguyên tố nào tồn tại nhiều trong cát trắng câu 2 công nghiệp silicat gồm gì vt 5 sao