Trên cùng 1 nửa mặt phẳng có bờ chứa tia Ox, vẽ tia Oz, Oy sao cho góc xOz = 40 độ; góc xOy = 80 độ. a. Hỏi tia nào nằm giữa 2 tia còn lại? Vì sao? b. Tính góc zOy.

Ý nghĩa của chỉ số cự ly vận chuyển trung bình trong ngành giao thông vận tải là gì?

Hãy cho biết con thủy tức sẽ phản ứng như thế nào khi ta dùng 1 chiếc kim nhọn đâm vào nó. Phản ứng của thủy tức có phải là phản xạ không, tại sao

17. A. pollution B. earplug C. dump D. dust Gạch chân âm u 18. A. untreated B. measure C. pleasure D. bread _______________ea 19. A. physical B. visual C. music D. because _______________si 20. A. thermal B. thankful C. there D. thorough _______________th 21. A. plates B. cakes C. mates D. places _______________es 22. A. changed B. learned C. laughed D. arrived _______________ed 23. A. emergency B. resident C. deposit D. prefer _______________e 24. A. wanted B. decided C. visited D. looked _______________ed 25. A. prison B. limestone C. kind D. tribe _______________i 26. A. which B. who C. when D. where _______________wh 27. A. carry B. hard C. card D. yard _______________a 28. A. twice B. flight C. piece D. mind _______________i 29. A. about B. around C. sound D. young _______________ou 30. A. cover B. oven C. coffee D. company _______________o II. Choose the word whose main stressed syllable is placed differently from that of the other in each group. 11. A. improve B. realize C. comfort D. influence 12. A. replace B. abroad C. surprise D. nation 13. A. prepare B. collect C. practise D. advice 14. A. pioneer B. difficult C. interesting D. hospital 15. A. expect B. happen C. local D. wander B. MULTIPLE CHOICE I. Choose the best answer to complete each of the following sentences. 1. If I were you, I _____________ for a new car to buy. A. would look B. will look C. look D. looking 2. If Jenny _____________ ill, she would go out with us. A. isn't B. aren't C. wasn't D. not been 3. If there _____________ fewer cars on the road, there would be less accident. A. is B. were C. are D. be 4. If people really cared about environment, they _____________ waste into rivers. A. didn't dump B. don't dump C. shan't dump D. wouldn't dump 5. You _____________ so tired if you went to bed earlier. A. won't be B shan't be C. couldn't be D. wouldn't be 6. If you really _____________ me, you would buy me a diamond ring. A. loved B. love C. loves D. loving 7. If I knew where she lived, I _____________ and see her. A. will go B. would go C. should go D. went 8. If I _____________ taller, I would buy this dress. A. am B. are C. were D. being 9. Filters do not remove all _____________ from water. A. contaminate B. contaminants C. contaminating D. contamination 10. _____________ is found under the ground in soil, rocks, etc. A. sea water B. salt water C. groundwater D. hot water 11. If I won a lottery, I _____________ a lot on charity. A. spend B. spent C. will spend D. would spend 12. If the supermarket is open, I _____________ some food there. A. will buy B. would buy C. bought D. has bought 13. I will talk to her if you _____________ to do it. A. won't want B. didn't want C. don't want D. doesn't want 14. If I _____________ more money, I would buy a better car. A. have B. had C. will have D. would have 15. The farmer had put down some rat _____________. A. poisoning B. poisoner C. poisoned D. poison 16. _____________ loss can be caused by noise pollution. A. sound B. hearing C. listening D. audio 17. Ships spill oil in oceans and rivers. This leads _____________ the death of many aquatic animals and plants. A. to B. in C. from D. at 18. Households pollute water sources by _____________ waste into ponds, lakes, and rivers. A. damaging B. dumping C. losing D. leading 19. This month’s electricity bill is too high _____________the air conditioner is turned on all the time. A. since B. due to C. although D. because of 20. The government has come _____________ a solution to the water problems of the city. A. up to B. up with C. to with D. on to

Tìm điều kiện m để phươnh trình sau có nghiệm (m^2+1)x^2-(m+3)x+1=0 Giúp mk với mk đang cần gấp

giúp mình bài này nhanh với mình đang cần gấp bạn nào trả lời đúng tớ tặng câu trả lời hay

mọi người ơi giúp mình bài này với ạ mình cảm ơn nhiều đang cần gấp nha

bn nào nhanh mik vote 5* mik cần ý b thui

Điền vào số 17 Sa Pa’s love market has become unique in the culture of the Mong and Dao ethnic groups (17) ______ a long time. Due to the distance between the villages, the market meets once a week on Sunday. On the Saturday night, guys and girls from villages come to Lao Cai (18) ______ one another. They talk, sing and (19) ______ different games according to their ethnic groups’ tradition. After the night, many couples become intimate and promise to see each other again on the following morning. Many of (20) ______ become husbands and wives in the spring. That is why the poets in Lao Cai called the market Sapa’s Love Market. The most popular Love Market in Lao Cai is organized in nowhere else but Sa Pa, where it is gaining more and more (21) ______ of not only the ethnic people but also the travelers from many places in the world. A: of B: at C: in D: for

các anh chị giải hộ em bài này với ạ