tính khối lượn hỗn hợp của 2,24 l khí co2 và 5,6 l khí H2S

cho bộ truyền động đau sau :bánh dẫn 1 có đường kính 15 cm,bánh dẫn 2 cso đường kính là 45cm 

a) tính tỉ số truyền i của bộ chuyển động đai 

b) hãy xác định tốc độ quay của bánh bị dẫn 2, biết rằng bánh dẫn 1 quay với tốc độ 27 vòng / phút

II. Rewrite the following sentences so that their meaning stays the same, using the words given.

1. The hotel we saw first was rather expensive. We decided to look for another.(so)

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2. There are more and more cars sold every day. The traffic in the streets is becoming more and more difficult.(because)

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3. The supermarket in our neighbourhood no longer opens. Very few people live there.(as)

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4. She lost her job because she was inexperienced.(because of)

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5. My mother didn’t mind our singing. We did it quietly.(since)

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6.Tet is a time for us to worship our ancestors. It’s also a time for family reunion. ( moreover)

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D.WRITING

I. Choose the correct sentence so that it has a similar meaning to the given one.

1. I think it is necessary for you to learn English every day.

A. You must learn English every day.

B. You have to learn English every day.

C. You don’t need to learn English every day.

D. I find it necessary to learn English every day.

2. He is very lazy so he always gets bad grades.

A. He always gets bad grades because he is very lazy.

B. Nobody in his class is lazier than him.

C. He shouldn’t be so lazy.

D. He always gets worse grades than his friends in his class.

3. I think it is rude of us to ask the teacher so much during our lesson.

A. We shouldn’t ask the teacher so much during our lesson.

B. We don’t have to ask the teacher so much during our lesson.

C. It doesn’t matter if we ask the teacher so much during our lesson.

D. We mustn’t ask the teacher so much during our lesson.

4. Our children prefer outdoor activities to watching TV.

A. Our children like watching TV better than playing outside.

B. Our children like playing outside better than watching TV.

C. Our children don’t like either watching TV or playing outside.

D. Our children don’t mind playing outside and watching TV.

5. Life in the city is noisier than life in the countryside.

A. Life in the countryside is not as noisy as life in the city.  C. Life in the countryside is as noisily as life in the city.

B. Life in the city is not as noisy as life in the countryside    D. Life in the city is not as noisily as life in the countryside.

6. You should come to the festival early, or you cannot join the procession. (IF)

A.   If you do not comes to the festival early, you cannot join the procession.

B.   You do not come to the festival early, if you cannot join the procession.

C.   If you do not come to the festival early, you cannot join the procession.

D.   If you do not come to the festival early, you cannot joins the procession.

7. Nam and Tom arrived late; therefore, they missed the most important part of the festival. (BECAUSE)

A. Because Nam and Tom arrived late, they missed the most important part of the festival.

B. Nam and Tom arrived late because they missed the most important part of the festival.

C. Nam and Tom arrived late, so they missed the most important part of the festival

D. Nam and Tom arrived late; therefore, because they missed the most important part of the festival.

III.Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks (1.25pts)

We spent two days with Mariano who told (1) …… about everything we were seeing as we drove through the Argentina countryside. He was very helpful and friendly- he went out of his way to stop whenever we wanted to and if he (3) …… know what we wanted to know he would ask the local people (2) …… information- as a result we gained (4) …… real insight into the way people live and the history and culture of the country, we really felt that reading the tourist guides did not give you the level of understanding of how Argentina actually is that we got from Mariano. We opted for the overnight stay in a typical Finca farmhouse- our hostess Bertha could not have been (5) …… hospitable. A very enjoyable trip which we recommend to anyone.

II. Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

     Children’s education is changing rapidly today. In the past, teachers made children sit still for hours. They made them memorize all sorts of things. In other words, children had to go on repeating things until they knew them by heart. Today, many teachers wonder if it is possible to make children learn at all. They say you can only help them learn. They say you must let children learn and discover things for themselves.

1.How is children’s education changing today?

            A. quickly                   B. slowly                     C. small                       D. large

2.What did teachers make children do in the past?

            A. stand in hours                                             B. memorize everything

            C. repeat their homework                               D. sit for days

3.Children in the past were made to learn everything ………….?

            A. by head                  B. by hand                  C. by hair                    D. by heart

            A.  give children more homework                  B.  make children learn

            C.  help them learn                                          D.  teach children at home

5.Today, the modern learning method is ……………

            A. letting children play computer games

            B. making children read a lot of books

            C. giving children less homework

            D. letting children discover things for themselves.