Giải bất phương trình và biểu diễn tập nghiệm trên trục số: 5 - 2x ≥ 0

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 28 to 34.

  The rules of etiquette in American restaurants depend upon a number of factors the physical location of the restaurant, e.g., rural or urban; the type of restaurant, e.g., informal or formal; and certain standards that are more universal. In other words, some standards of etiquette vary significantly while other standards apply almost anywhere. Learning the proper etiquette in a particular type of restaurant in a particular area may sometimes require instruction, but more commonly it simply requires sensitivity and experience. For example, while it is acceptable to read a magazine in a coffee shop, it is inappropriate to do the same in a more luxurious setting. And, if you are eating in a very rustic setting, it may be fine to tuck your napkin into your shirt, but if you are in a sophisticated urban restaurant this behavior would demonstrate a lack of manners. It is safe to say, however, that in virtually every restaurant it is unacceptable to indiscriminately throw your food on the floor. The conclusion we can most likely draw from the above is that while the types and locations of restaurants determine etiquette appropriate to them, some rules apply to all restaurants.

What topic is this passage primarily concerned?

A. Instruction in proper etiquette

B. Rules of etiquette 

C. Variable and universal standards of etiquette 

D. The importance of good manners

Khẳng định nào sau đây về mô hình hoạt động của ôperôn Lac ở E. Coli là không đúng?

A. Trong operon Lac có 3 gen cấu trúc và 1 gen điều hòa

B. Trong môi trường có lactose, gen điều hòa vẫn được phiên mã

C. Chất ức chế bám vào vùng vận hành khi trong môi trường không có lactose

D. Đột biến gen xảy ra tại gen Z không ảnh hưởng đến cấu trúc của 2 chuỗi pôlipeptit do 2 gen Y và A qui định

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best completes each of the following exchanges.

- Kelly: “How lovely your dogs are!” - Tim: “ _____________ ”

A. Really? They are.

B. Thank you, it is nice of you to say so.

C. Can you say that again?

D. I love them very much.

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in pronunciation in each of the following questions.

A. improvement

B. communicate

C. occasional

D. reservation