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An atomic clock that operates with an ammonia molecule may be used to check the accuracy of predictions based on Einstein’s relativity theories, according to which a clock in motion and [r]
(1)Test N13 I Choose the correct answer
1 I don’t remember the front door when I left home this morning
A to lock B locking C locked D to have locked Banks only money if they are sure it will be paid back
A borrow B lend C interest D charge I left my last job because I had no to travel
A place B position C opportunity D possibility In order to buy his house he had to obtain a large from his bank A loan B finance C capital D debt How many people you think his car would ?
A occupy B hold C fit D load
6 Under the circumstances it be best to wait for a few weeks
A seemed B ought C might D should
7 Students sometimes support themselves by of evening jobs
A ways B means C efforts D method
8 The newspaper did not mention the of the damage caused by the fire A range B extent C amount D quantity The student failed to meet the necessary for admission to the course A fulfillments B requirements C qualities D aptitudes 10 No one really knows who composed this piece of music, but it has been to Bach A identified B associated C referred D attribute
II Give the correct forms of the words in brackets
1 Can you measure the of this window? (BROAD) Various kinds of flowers this garden (BEAUTIFUL)
3 We had a marvelous holiday and our trip to Dalat was (FORGET) She got very angry but later, she apologized for her (PATIENT) His boss told him off because he had behaved (RESPONSIBLE) This knife is very blunt It needs (SHARPEN)
7 The government have had plans to our country (INDUSTRY) The professor explained his ideas with great (CLEAR)
9 He to hit me if I didn’t hand over my money (THREAT) 10 It was a complete due to poor planning (FAIL)
III Give the correct forms of the verbs in brackets
1 - Would your children mind (keep) quiet for a moment I’m trying (fill) in a form - It’s no use (ask) children (keep) quiet They can’t help (make) a notice
2 The teacher asked those who (complete) their tests (turn) in their papers
3 The police just (put up) a railing here (prevent) people(rust) out of the station and (dash) straight across the road
If he (not drink) too much last night, he (not have) a bad headache Since he (buy) a new car, he (drive) (work) every day
6 I hope Brenda still (work) for me when I retire in six years’ time She (retire) herself a few years afterwards, because she then (be) sixty She (work) for the firm for twenty years by then
IV Rewrite the following sentences in the way that it means exactly the same as the sentences printed before it
1 It was careless of you to leave the windows open last night
You shouldn’t I am sorry I was rude to you last night
I apologize “Why didn’t you report the incident to the police last week?” The officer asked her The officer wanted
(2)4 We must find him no matter where he is hiding
Wherever A country can’t be prosperous if it’s not quite independent
Only They went on smoking all through the meal
They didn’t These new machines have put an end to queuing
Before these The instructions say you just add boiling water to the soup powder
The soup powder The house seemed to have been unoccupied for several months
It looked 10 I remembered and so did she
He didn’t
V Read the following passage and answer the questions
The accuracy of scientific observations and calculations is always at the mercy of the scientist’s time keeping methods For this reason, scientists are interested in devices that give promise of more precise time keeping
In their search for precision, scientists have turned to atomic clocks that depend on various vibrating atoms or molecules to supply their “ticking” This is possible because each kind of atom or molecule has its own characteristic rate of vibration The nitrogen atom in ammonia, for example, vibrates or “ticks” 24 billion times a second
One such atomic clock is so accurate that it will probably lose no more than a second in 3000 years It will be of great importance in fields such as astronomical observation and long range navigation Te heart of this Atomichron is a cesium atom that vibrates 9.2 billion times a second when heated to the temperature of boiling water
An atomic clock that operates with an ammonia molecule may be used to check the accuracy of predictions based on Einstein’s relativity theories, according to which a clock in motion and a clock at rest should keep time differently Placed in an orbiting satellite moving at a speed of 18,000 miles an hour, the clock could broadcast its time readings to a ground station, where they would be compared with the readings on a similar model Whatever differences develop would be checked against the differences predicted
1.The selection says that the accuracy of scientific observation depends on A methods of measurement B time keeping methods C basic assumptions D earlier experiments Scientists expect that atomic clock will be
A more precise B absolutely accurate C more durable D indestructible Atomic clocks differ according to
A function B type of molecule or atom used C rate of vibration D both B & C the Atomichron will be used in
A making astronomical observations B broadcasting C measuring vibration rates D all of the above From the selection, we may assume that temperature changes
A affect only ammonia molecules B may affect vibration rate of atoms C affect the speed at which atoms travel D not affect atoms in any way Identical atomic clocks may be used to check
A the effects to outer space on an atomic clock B the actual speed of an orbiting satellite C the accuracy of predictions based on theories of relativity D all of Einstein’s theories Implied but not stated:
A Precise time taking is essential in science
B Scientists expect to disprove Einstein’s relativity’s theories
(3)C Atomic clocks will be important in space flight D The rate of vibration of an atom never varies An appropriate title for this selection would be:
A A Peacetime Use of the Atom B Atoms and Molecules C The Satellite Timekeepers D The Role of the Clock
VI Fill in each numbered blank with a suitable word
One morning last summer Jessie (1) some sandwiches for her husband’s lunch They were sausage sandwiches There was one small sausage (2) over, so Jessie gave (3) to Henry, her little dog Henry ate it up Half an hour (4) , the dog got ill He kept (5) shaking his head, and rubbing it (6) his foot Jessie thought, “He’s ill He must have eaten (7) that didn’t agree with him Maybe that (8) was bad.” Then she remembered her husband’s (9) She ran to the telephone and (10) Jim at his office in town
VII Pick out the word whose underlined part is pronounced differently from those of the others
1 a jumbo b junior c junk d juggle a management b manacle c malt d malfunction a troll b doll c tropical d otter
4 a relents b religion c relics d relive a spill b shield c cement d executive a third b threat c thus d thunder a wholly b whiten c whose d whoop a launch b digestion c question d Greenwich a canoe b career c carnivore d carouse
10 a hood b hook c doom d good
VIII Sentence building
1 I / be / invited / her party / the occasion / her 18th birthday / last week.
……… Outside / shop / a lot of people / selling fruit / other things
……… She / used to / stay / her uncle’s / she / a child
……… I / write / Jim / last week / But so far / I / not receive / any reply
……… He / used to / play tennis / but / now / turn / football
……… She wondered / why / Peter / not phone / her
……… police / prevent / prisoners / escape
……… car / cost / me / few hundred pounds / only
……… It / impossible / them / come / Sunday
……… 10 He / investigate / case / a week
………
(4)Answer keys to test N13
I
1.A 2.B 3.C 4.A 5.B 6.D 7.B 8.B 9.B 10.D II.
1 breadth beautify unforgettable impatience irresponsibly sharpening industrialize8 clarify/clearness threatened 10 failure III.
1.keeping, to fill, asking, to keep, making had completed, to turn
3 have just put, to prevent, rushing, dashing hadn’t drunk, wouldn’t have had
5 bought, has been driving, to work will be working, retires, will then be, will have been working IV.
1 You shouldn’t have left the windows open last night I apologize for being rude to you last night
3 The officer wanted to know why she hadn’t reported the incident to the police the previous week
4 Wherever he is hiding we must find him
5 Only when it’s quite independent can a country be prosperous They didn’t stop smoking all through the meal
7 Before these new machines were invented, people had to queue
8 The soup powder just needs boiling water added to it according to the instructions It looked as if (though) the house had been unoccupied for several months
10 He didn’t forget and neither did she V.
1 B B D A B C A A VI.
1 made / prepared left it later on
6 with something sausage sandwiches 10 called / phoned VII.
1 b c a c b c b b c 10 c VIII.
1 I was invited to her party on the occasion of her 18th birthday last week.
2 Outside the shop there were / are a lot of people selling fruit and other things She used to stay at her uncle’s when she was a child
4 I wrote to Jim last week But so far I have not received any reply yet He used to play tennis but now he turns to football
6 She wondered why Peter did not phone her
7 The police have prevented prisoners from escaping The car cost me a few hundred pounds only
9 It is impossible for them to come on Sunday 10 He has been investigating the case for a week