Chất nào sau đây không phải là polime?

A. Chất béo.

B. Xenlulozơ.

C. Poli(vinyl clorua).

D. Polibuta-1,3-đien.

Read the following passage and choose the letter A, B, C or D to indicate the correct answer to each of the questions from 55 to 64.

A number of factors related to the voice reveal the personality of the speaker. The first is the broad area of communication, which includes imparting information by use of language, communicating with a group or an individual and specialized communication through performance. A person conveys thoughts and ideas through choice of words, by a tone of voice that is pleasant or unpleasant, gentle or harsh, by the rhythm that is inherent within the language itself, and by speech rhythms that are flowing and regular or uneven and hesitant, and finally, by the pitch and melody of the utterance. When speaking before a group, a person's tone may indicate uncertainty or fright, confidence or calm. At interpersonal levels, the tone may reflect ideas and feelings over and above the words chosen, or may believe them. Here the participant’s tone can consciously or unconsciously reflect intuitive sympathy or antipathy, lack of concern or interest, fatigue, anxiety, enthusiasm or excitement, all of which are .usually discernible by the acute listener. Public performance is a manner of communication that is highly specialized with its own techniques for obtaining effects by voice and /or gesture. The motivation derived from the text, and in the case of singing, the music, in combination with the performer's skills, personality, and ability to create empathy will determine the success of artistic, political, or pedagogic communication.

Second, the voice gives psychological clues to a person's self-image, perception of others, and emotional health. Self-image can be indicated by a tone of voice that is confident, pretentious, shy, aggressive, outgoing, or exuberant, to name only a few personality traits. Also the sound may give a clue to the facade or mask of that person, for example, a shy person hiding behind an overconfident front. How a speaker perceives the listener's receptiveness, interest, or sympathy in any given conversation can drastically alter the tone of presentation, by encouraging or discouraging the speaker. Emotional health is evidenced in the voice by free and melodic sounds of the happy, by constricted and harsh sound of the angry, and by dull and lethargic qualities of the depressed.

Why does the author mention "artistic, political, or pedagogic communication" in line 15?

A. To contrast them to singing 

B. As examples of public performance 

C. As examples of basic styles of communication 

D. To introduce the idea of self-image

Em cx dc nhận, mà thực sự em sợ sẽ bị thế thật, may mà chị em bảo em xóa đi chứ ko thì...

Trong quần thể người có một số đột biến sau:

(1) Ung thư máu.                     (2) Hồng cầu hình liềm.                      (3) Bạch tạng.

(4) Claiphento.              (5) Dính ngón 2 và 3.                (6) Máu khó đông.

(7) Mù màu.                  (8) Đao.                                   (9) Tơcnơ.

Có bao nhiêu thể đột biến có ở cả nam và nữ:

A. 8  

B. 6   

C. 7   

D. 5

Mik nghĩ là hai chú ấy đã làm sai rùi, các chú có thề làm theo cách khác mà.