Read the following passage and mark the letter A,B,C or D on your answer sheet to indicate the correct word or phrase for each of blanks. Fill in the appropriate word in question 52

When you read something in a foreign language, you frequently come across words you do not (45)______ understand. Sometimes you (46)______ the meaning in a dictionary and sometimes you guess. The strategy you adopt depends very much upon the (47)______of accuracy you require and the time at your disposal. If you are the sort of person who tends to turn to the dictionary frequently, it is (48)_______remembering that every dictionary has its limitations. Each definition is only an approximation and one builds up an accurate picture of the meaning of a word only after meeting it in a (49)__________of contexts. It is also important to recognize the special dangers of dictionaries that translate from English into your native language and vice versa. If you must use a dictionary, it is usually far safer to (50)________an English- English dictionary. In most exams you are not permitted to use a dictionary. (51)__________you are allowed to use one, it is very time- consuming to look up words, and time in exams is usually limited. You are, (52)______, forced to guess the meaning of unfamiliar words. When you come across unknown words in an exam text, it is very easy to panic. However, if you develop efficient techniques for guessing the meaning, you will(53)__________a number of possible problems and help yourself to understand far more of the text than you at first likely. Two strategies which may help you guess the meaning of a word are: using contextual clues, both within the sentence and outside, and making uses (54)_____ clues derived from the formation of the word.

A. but

B. however

C. so that

D. therefore

Các tác nhân hóa học gây ô nhiễm môi trường nước gồm :

A. Các kim loại nặng :Hg, Pb, Sb ...

B. Các nhóm : NO3-, PO43-, SO42-.

C. Thuốc bảo vệ thực vật , phân bón hóa học.

D. Cả A, B, C.

Cho cặp P thuần chủng về các gen tương phản giao phấn với nhau. Tiếp tục tự thụ phấn các cây F₁ với nhau, thu được F₂ có 125 cây mang kiểu gen aabbdd. Về lí thuyết, số cây mang kiểu gen AaBbDd ở F₂ là:

A. 8000

B. 250

C. 1000

D. 125

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.

According to the passage, which of the following is a universal rule of etiquette?

A. reading a magazine at a coffee shop 

B. not throwing food on the floor 

C. ating in rustic settings 

D. tucking a napkin in your shirt

Mỗi bạn An , Bình chọn ngẫu nhiên 3 chữ số trong tập 0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9  Tính xác suất để trong hai bộ ba chữ số mà An, Bình chọn ra có đúng một chữ số giống nhau. 

Tìm tập nghiệm của phương trình C x 2 + C x 3 = 4 x

A.{0}.

B.{-5;5}.

C.{5}.

D.{-5;0;5}.

mở đầu cuộc xây dựng độc lập chủ nghĩa của nước ta bắt đầu từ ngày tháng năm nào