Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each question from 30 to 34.

  Ever since humans have inhabited the earth, they have made use of various forms of communication. Generally, this expression of thoughts and feelings has been in the form of oral speech. When there is a language barrier, communication is accomplished through sign language in which motions stand for letters, words, and ideas. Tourists, the deaf, and the mute have had to resort to this form of expression. Many of these symbols of whole words are very picturesque and exact and can be used internationally, spelling, however, cannot.

  Body language transmits ideas or thoughts by certain actions, either intentionally or unintentionally. A wink can be a way of flirting or indicating that the party is only joking. A nod signifies approval, while shaking the head indicates a negative reaction.

Other forms of nonlinguistic language can be found in Braille (a system of raised dots read with the fingertips), signal flags, Morse code, and smoke signals. Road maps and picture signs also guide, warm, and instruct people. While verbalization is most common form of language, other systems and techniques also express human thoughts and feelings.

Which form other than oral speech would be the most commonly used among blind people?

A. Picture signs

B. Braille

C. Signal flags

D. Body language

Số phức liên hợp của số phức z = 5 +6i là

A.  z = -5 +6i

B.  z = -5 -6i

C.  z = 6 -5i

D.  z = 5 -6i

Thí nghiệm nào đã làm với nam châm chứng tỏ rằng xung quanh Trái Đất có từ trường?

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

While he was composing the song, he imagined the story in his head. He _____________  this music video to the audience for better understanding about his compositions.

A. added

B. dedicated

C. committed

D. admitted

Hỗn hợp M gồm 2 axit cacboxylic đơn chức X và Y ( là đồng đẳng kế tiếp, M X < M Y ). Đốt cháy hoàn toàn 8,2g M cần 10,4g O₂ thu được 5,4g H₂O. Đun nóng 8,2g M với etanol (H₂SO₄ đặc) tạo thành 6g hỗn hợp este. Hóa hơi hoàn toàn hỗn hợp este trên thu được thể tích hơi bằng thể tích của 1,82g N₂ ( trong cùng điều kiện nhiệt độ và áp suất). Hiệu suất phản ứng tạo este của X và Y lần lượt là

A. 60% và 40% 

B. 50% và 40%

C. 50% và 50%

D. 60% và 50%

Chất nào sau đây có thể làm mất màu dung dịch brom?

A. axit axetic

B. axit acrylic

C. etylen glicol

D. axit oxalic

* 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 from 24 to 30.

  In Viet Nam festivals often take place during the three months in spring and in autumn when people have a lot of leisure time. In addition, the climate in spring and autumn is especially suitable for holding festivals and for festivals goers to enjoy. Traditional festivals constitute a form of cultural activities, a spiritual product which the people have created and developed during the course of history. From generation to generation, the Vietnamese people preserve the fine tradition of “remembering the source while drinking water.” Festivals are events which represent this tradition of the community as well as honour the holy figures named as “gods” -the real persons in national history or legendary persons. The images of gods converge the noble characteristics of mankind. They are national heroes who fought against foreign invaders, reclaimed new lands, treated people, fought against natural calamities, or those legendary characters who affect the earthly life.

  Accordingly, first and foremost, festivals are events when people pay tribute to divinities that rendered merits to the community and the nation. These are occasions when people come back to either their natural or national roots, which form a sacred part in their mind. Furthermore, testivals represent the strength of the commune or village, the local region or even the whole nation. Worshipping the same god, the people unite in solidarity to overcome difficulties, striving for a happy and wealthy life.

  Moreover, festivals display the demand for creativity and enjoyment of spiritual and material cultural values of all social strata. They become a form of education under which fine traditional moral values can be handed from one generation to the next in a unique way of combining spiritual characters with competition and entertainment games. Festivals are also the time people can express their sadness and worries in a wish that gods might bestow favour on them to help them strive for a better life.

(Adapted from: Overview of Traditional Festivals - Viet Mam, Country and Peoples)

Which of the following is NOT mentioned as a value of festivals?

A. Showing community’s union

B. Remembering national heroes 

C. Questioning personal bad lucks

D. Educating young generations