Đề thi tuyển sinh đại học năm 2014 môn Tiếng Anh Khối A1 - Mã đề 973 (Kèm đáp án)

 metal atoms lose at least one of their 
outermost electrons. This leaves the metal atoms with a positive charge and they are now strictly ions. The 
lost electrons are free to move in what is known as a sea of electrons. Since the electrons are negatively 
charged they attract the ions and this is what keeps the structure together. 
An electric current is a flow of charge and since the electrons in the sea of electrons are free to move they 
can be made to flow in one direction when a source of electrical energy such as a battery is connected to the 
metal. Hence we have an electric current flowing through the wire, and this is what makes metals such good 
conductors of electricity. The only other common solid conducting material that pencil users are likely to 
encounter is graphite (what the ‘lead’ of a pencil is made from). Graphite is a form of carbon and again the 
carbon atoms bond in such a way that there is a sea of electrons that can be made to flow as an electric 
current. Likewise, if we have an ionic substance like salt we can make the electrically charged ions flow to 
create a current but only when those ions are free to move, either when the substance is a liquid or dissolved in 
water. In its solid state an ionic substance like salt cannot conduct electricity as its charged ions cannot flow. 
Electrical insulators are substances that cannot conduct electricity well either, because they contain no 
charged particles or any charged particles they might contain do not flow easily. Water itself is a poor 
conductor of electricity as it does not contain a significant amount of fully charged particles (the ends of a water 
molecule are partly charged but overall the molecule is neutral). However, most water we encounter does 
contain dissolved charged particles, so it will be more conductive than pure water. Many of the problems that 
occur when touching electrical devices with wet hands result from the ever-present salt that is left on ... ions 
C. the lost electrons cannot move freely in the sea of electrons 
D. electrons can flow in a single direction 
Trang 1/6 – Mã đề 973 
 Trang 2/6 – Mã đề 973 
Question 5: Salt in its solid state is not able to conduct electricity because ______. 
A. it cannot create any charged ions B. its charged ions can flow easily 
C. its charged ions are not free to move D. it has free electrons 
Question 6: The word “they” in paragraph 3 refers to ______. 
A. charged particles B. electrical insulators 
C. electric currents D. charged ions 
Question 7: Water is a poor conductor because it contains ______. 
A. only a small amount of fully charged particles 
B. only a negative electric charge 
C. no positive or negative electric charge 
D. only a positive electric charge 
Question 8: We can have problems when touching electrical devices with wet hands because ______. 
A. the water containing no charged particles makes it more conductive 
B. the water contains too many neutral molecules 
C. the water dissolves the salt on our skin and becomes more conductive 
D. the water itself is a good conductor of electricity 
Question 9: Which of the following is NOT true according to the passage? 
A. Graphite is a common solid substance that can conduct electricity. 
B. Some materials are more conductive than others. 
C. Pure water is much more conductive than most water we encounter every day. 
D. Salt can conduct electricity when it is molten or dissolved. 
Question 10: Which of the following could best serve as the title of the passage? 
A. Electrical Insulators B. Electrical Energy 
C. Electrical Conductivity D. Electrical Devices 
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the 
following questions. 
Question 11: ______ he got top marks at high school, he never went to university. 
A. Although B. Despite C. Nevertheless D. Meanwhile
Question 12: We could have caught the last train, but we ______ five... B. helpless C. defenseless D. vulnerable 
Question 20: Applications _____ in after 30th April will not be considered. 
A. send B. which sent C. sent D. that is sent 
Question 21: The superstar, accompanied by the other members of the band, ______ to visit our school next 
week. 
A. has had B. are going C. are D. is going 
Question 22: The higher the content of carbon dioxide in the air is, ______. 
A. the more heat it retains B. the heat it retains more 
C. it retains the more heat D. more heat it retains 
 Trang 3/6 – Mã đề 973 
Question 23: Kay: “I wouldn’t do that if I were you.” 
John: “______” 
A. Wouldn’t you? Why? B. I’d rather you didn’t. 
C. Would you, really? D. It’s out of the question. 
Question 24: The theory of relativity ______ by Einstein, who was a famous physicist. 
A. developed B. is developed C. develops D. was developed 
Question 25: Mrs. Chau has managed the department ______ that she’ll be promoted next month. 
A. too successful B. too successfully C. very successful D. so successfully 
Question 26: Sammy had worked in England for a year ______ moving to Scotland. 
A. while B. before C. once D. until 
Question 27: Be sure not to rely too ______ on your mother tongue when you are learning a foreign language. 
A. numerously B. heavily C. abundantly D. severely 
Question 28: “It’s about time you ______ your homework, Mary.” 
A. must do B. did C. will do D. do 
Question 29: ______ was the tea that we couldn’t drink it. 
A. How strong B. So strong C. No longer D. Hardly ever 
Question 30: The girl was used ______ birthday presents from her brothers. 
A. to receive B. to be receiving C. to being received D. to receiving 
Question 31: We received a call from the teacher ______ charge of our course. 
A. to B. on C. in D. at 
Question 32: ______ always gives me real pleasure. 
A. While arranging flowers B. The flowers are arranged 
C. Arranging flowers D. I arrange flowers 
Question 33: I could hear voices but I couldn