ĐỀ ÔN THI TN – ĐH NĂM 2011 - TEST 1
I. Pick out the word that has the underlined part pronounced differently from the
rest
1. a. symbol b. cycle c. skyscraper d. apply
2. a. soon b. good c. too d. food
3. a. submit b. succeed c. subway d. support
4. a. honest b. honour c. ghost d. house
5. a. plough b. cough c. laugh d. enough
II. Choose the correct answers
6. He likes beer and fried chicken, ______ is the reason ______ he is too fat.
a. which / when b. that / why c. who / where d. whose /
whom
7. I ______ drink coffee.
a. used not to b. didn't use to c. not used to d. a and b
8. He _____ hungry. He has just had lunch with me.
a. can't be b. can't have been c. couldn't be d. couldn't have
been
9. Nancy got a scholarship to study abroad last school year. She _____ very happy.
a. must be b. must being c. must have be d. must have
been
10. This is the only library ______ we can obtain scientific information.
a. where b. which c. that d. why
11. I'd rather you _____ to work late.
a. don't go b. didn't go c. not go d. not going
12. Tim was washing the clothes when the doorbell _____.
a. is ring b. rings c. was ringing d. rang
13. Never put ______ until tomorrow what you can do today.
a. off b. of c. on d. from
14. You have to study harder to _____ your classmates.
a. lose track of b. keep up with c. take care of d. put an end to
15. This puzzle is short, ______ difficult.

that it has temporarily stored. When the release occurs the electrons in the high energy
level fall back to the low energy level. But as it does so, it emits the extra energy as a
pulse that we may see as light. A possible jump of each of the electrons round the sodium
nucleus has an exact amount or quantum of energy associated with it.
The word "LASER" is an acronym. The letters of the word come from "Light
Amplified Stimulated Emission of Radiation". The laser beam is made by exciting the
atoms of a suitable material - ruby is one - until most of the atoms have electrons orbit in
a higher energy level than usual The excitation is then stopped and all the excited
electrons fall back together to their normal orbits, and emit a pulse of light of the same
energy. In this way, an intense beam of light is generated for a very short time. Every
pulse in this beam is in step with every other pulse. A beam of light that is both
monochromatic and coherent is obtained.
Laser beams carry surprisingly intense amounts of energy and so they can be
dangerous to living tissues. The tissue absorbs the light in the beam and converts it into
heat. If heat is generated in living tissues more quickly than it can be dissipated, then
local heating of the tissues will occur. This local heating can be severe enough to kill the
cells that the beam impinges on. Therefore, it is necessary to protect the human eyes that
are very sensitive to this kind of damage when laser beams are being used. The damage
can be done very quickly so protection from accident is very necessary.
36. What does the acronym LASER come from?
37. To understand what laser is, what should one do first?
38. How are the electrons when the atom of sodium is in its unexcited state?
39. Why are laser beams dangerous to living tissues?
40. What are the suitable materials to make laser beams that are referred in the text?
VI. Rewrite the sentences as directed without changing the original meaning
41. I do not know Russian.
 I have_________________________________________________________________
42. As soon as Tom bought a television set. Peter bought a record player.
 No sooner _____________________________________________________________
43. Daisy's sister is one of the most popular singers in our city.