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dungdzvcl
2 năm trước
Trong thí nghiệm Y-âng về giao thoa ánh sáng nguồn phát đồng thời các bức xạ cí bước sóng λ1= 750nm, λ2 = 675nm, λ3= 600nm. tại điểm M trong vùng giao thoa trên màn mà hiệu khoảng cách đến hai khe bằng 1,5µm có vân bức xạ: A.λ2 và λ3 B.λ3 C.λ1 D.λ2
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Bài 1: Điền vào chỗ trống. 1. If you (eat)........ too much junk food, you (not lose)....... weight. 2. If I (not make)......... breakfast tomorrow morning, my girlfriend (not love)....... me anymore. 3. If they (not hurry)........., they (not catch)......... the train. 4. If we meet at 9:30, we (to have).......... plenty of time. Bài 2: Identify the one that has a mistake by circling the corresponding letter a,b,c,d. 1. If/we /will reduce/ the speed of population growth, there /will be/ less pressure/ on/ the earth. A B C D 2. Unless/ we /leave/ a bowl of the water under the sun, /it/ will evaporate. A B C D 3. If/ we continue /to use/ fuels at the /current rate/, we /would soon have/ to face a fuel crisis. A B C D 4. If/ tomorrow /the weather/ will be/ bad, the match /will be/ postponed. A B C D Bài 3: Rewrite sentences 1. If you will see Mike today, please ask him to phone me. - If ..................................................................... 2. You'll ask the teacher. He'll exlanin the lesson to you. - If......................................................................... 3. I'll buy a new hat. I'll give it to you. - If ......................................................................... Bài 4: Fill in the gaps with the correct verb tense of the verbs in brackets. Make sure you the sentences is a first type conditional sentences. 1. If you .................(help) me, I ................(help) you. 2. If they .................( catch) the bus, they .........(arrive) on time. 3. If my parents......... (support) me, I .....(be) a better person. 4. If it ..... (rain), I ....(get) wet 5. Sally and Elizabeth ....(go) out tonight if their parents....... (allow) it. 6. They .... (visit) Eiffel Tower if they ...(go) to France. 7. If I ...(pass) the year, my parents ...... (be) very disappointed 8. If I...... (not/pass) the year, my parents...... (be) very disappointed 9. If the cable TV ........ (not/work), we ....(rent) a DVD. 10. If the baby....... (not/eat), we .....(see) the doctor. 11. If the T-shirt....... (suit) me, I .... (buy) it. 12. If you .... (continue) on a diet, you ..... (get) sick. 13. If you .... (be) a good listener, you .... (have) many friends. 14. If you (not/be) careful, you .......(spoil) the machine. 15. If she ........ (not/be) careful, she ....... (not/have) enough money left. 16. If you ...(get) enought sleep, you ...(feel) healthier. 17. My parents........(give) me a hug, if I ...(arrive) home early 18. If you ........(not/be) careful, you ...(fall). 19. If she ...(eat) that mayonnaise, she ...(be) sick. 20. If they.........(not/behave), their parents ...(punish) them. 21. She ...(go) on a trip if she ....... (have got) holidays in August. 22. I....(get) dehydrated if you....(not/drink) more water. 23. If it......(be) too much heat, I ...(turn off) the air conditioning. 24. You........ (understand) conditional sentences if you....... (practise) carefully. Khá dài nên các bạn giúp mik nha, mik sẽ cho 5 sao luôn

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