15 đề thi thử thpt quốc gia môn Tiếng Anh có đáp án + giải thích chi tiết VnDoc com

 
 
 
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The universal symbol of the Internet era communications, the @ sign used in e-mail 
addresses to signify the word 'at', is (23) a 500-year-old invention of Italian merchants, a 
Rome academic has revealed. Giorgio Stabile, a science professor at La Sapienza University, 
claims to have stumbled on the earliest known example of the symbol's use, as a(n) (24)
of a 
measure of weight or volume. He says the sign represents an amphora, a measure of capacity 
based on the terracotta jars used to transport grain and liquid in the ancient Mediterranean world. 
The professor unearthed toe ancient symbol in the course of research for a visual history of 
the 20th century, to be published by the Treccani Encyclopedia. The first (25) instance of its 
use, he says, occurred in a letter written by a Florentine merchant on May 4, 1536. He says the sign 
made its way along trade routes to northern Europe, where it came to represent 'at the price of‘, its 
contemporary accountancy meaning. 
Professor Stabile believes that Italian banks may possess even earlier documents (26) 
the 
symbol lying forgotten in their archives. The oldest example could be of great value. It could 
be used (27)
publicity 
purposes and to enhance the prestige of the institution that owned it, he says. The race is on 
between the mercantile world and the banking world to see who has the oldest documentation of 
@. 
Question 23: A. actually B. truly
C. essentially
D. accurately
Question 24: A. proof
B. sign
C. evidence D. indication
Question 25: A. known
B. knowing C. knowable
D. knowledgeable
Question 26: A. taking
B. carrying C. delivering
D. bearing
Question 27: A. on  B. for
C. with
D. by 
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 40 to 49. 
A rather surprising geographical feature of Antarctica is that a huge freshwater lake, one of the 
world's largest and deepest, lies hidden there under four kilometers of ice. Now known as Lake 
Vostok, this huge body of water is located under the ice block that comprises Antarctica. The lake is 
able to exist in its unfrozen state beneath this block of ice because its waters are warmed by 
geothermal heat from the earth's core. The thick glacier above Lake Vostok actually insulates it from 
the frigid temperatures on the surface. 
The lake was first discovered in the 1970s while a research team was conducting an aerial 
survey of the area. Radio waves from the survey equipment penetrated the ice and revealed a body 
of water of indeterminate size. It was not until much more recently that data collected by satellite 

 
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made scientists aware of the tremendous size of the lake; the satellite-borne radar detected an 
extremely flat region where the ice remains level because it is floating on the water of the lake. 
The discovery of such a huge freshwater lake trapped under Antarctica is of interest to the 
scientific community because of the potential that the lake contains ancient microbes that have 
survived for thousands upon thousands of years, unaffected by factors such as nuclear fallout and 
elevated ultraviolet light that have affected organisms in more exposed areas. The downside of the 
discovery, however, lies in the difficulty of conducting research on the lake in such a harsh climate 
and in the problems associated with obtaining uncontaminated samples from the lake without 
actually exposing the lake to contamination. Scientists are looking for possible ways to accomplish 
this. 

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