Đề thi tuyển sinh đại học năm 2014 môn Tiếng Anh Khối A1 - Mã đề 473 (Kèm đáp án)

p a night, (4)________ teenagers require nine or ten 
hours. According to medical experts, one in five youngsters (5)_________ anything between two and five hours' 
sleep a night less than their parents did at their age. 
This (6)_________ serious questions about whether lack of sleep is affecting children's ability to concentrate 
at school. The connection between sleep deprivation and lapses in memory, impaired reaction time and poor 
concentration is well (7)_________. Research has shown that losing as little as half an hour's sleep a night can 
have profound effects (8)________ how children perform the next day. A good night's sleep is also crucial for 
teenagers because it is while they are asleep (9)________ they release a hormone that is essential for their 
'growth spurt' (the period during teenage years when the body grows at a rapid rate). It's true that they can, to 
some (10)________, catch up on sleep at weekends, but that won't help them when they are dropping off to 
sleep in class on a Friday afternoon. 
By Tim Falla and Paul A. Davies. Solutions Advanced. OUP 
Question 1: A. behind time B. in time C. at time D. about time 
Question 2: A. less B. much C. little D. few 
Question 3: A. danger B. threat C. risk D. jeopardy 
Question 4: A. whereas B. or C. because D. so 
Question 5: A. gets B. makes C. puts D. brings 
Question 6: A. comes B. raises C. results D. rises 
Question 7: A. established B. acquired C. arranged D. organized 
Question 8: A. in B. on C. at D. to 
Question 9: A. at which B. that C. where D. which 
Question 10: A. point B. rate C. level D. extent 
Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to 
the underlined word(s) in each of the following questions. 
Question 11: Now many people who shop at a health food store instead of a local supermarket are much more 
likely to find a healthy, sugar-free beverage. 
A. harmful to health B. full of preservatives 
C. ben...ard of hearing D. able to hear 
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 16 to 25. 
The ability to conduct electricity is one of the key properties of a metal. Other solid materials such as silicon 
can conduct electricity but only effectively at certain temperatures. Also, some substances such as salt (sodium 
chloride) can conduct when molten or when dissolved in water. The ability of metals to conduct electricity is 
due to how their atoms bond together. In order to bond together the 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... important properties of metals 
Question 17: According to the passage, a metal can conduct electricity due to ______. 
A. the absence of free electrons 
B. the loss of one electron in the core of its atoms 
C. the way its atoms bond together 
D. its atoms with a positive charge 
Question 18: The word “outermost” in paragraph 1 mostly means ______. 
A. nearest to the inside B. furthest from the inside 
C. the heaviest D. the lightest 
Question 19: The atoms of a metal can bond together because ______. 
A. electrons can flow in a single direction 
B. the lost electrons cannot move freely in the sea of electrons 
C. they lose all of their electrons 
D. negatively charged electrons attract positive ions 
Question 20: Salt in its solid state is not able to conduct electricity because ______. 
A. it has free electrons B. its charged ions are not free to move 
C. its charged ions can flow easily D. it cannot create any charged ions 
Question 21: The word “they” in paragraph 3 refers to ______. 
A. electrical insulators B. electric currents 
C. charged particles D. charged ions 
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Question 22: Water is a poor conductor because it contains ______. 
A. only a small amount of fully charged particles 
B. only a positive electric charge 
C. no positive or negative electric charge 
D. only a negative electric charge 
Question 23: We can have problems when touching electrical devices with wet hands because ______. 
A. the water dissolves the salt on our skin and becomes more conductive 
B. the water contains too many neutral molecules 
C. the water containing no charged particles makes it more conductive 
D. the water itself is a good conductor of electricity 
Question 24: Which of the following is NOT true according to the passage? 
A. Salt can conduct electricity when it is molten or dissolved. 
B. Some materials are more conductive than others. 
C. Graphite is a common solid substance that can conduct electricity. 
D. Pur