22. Population growth rates vary among regions and even among countries within the
same region
A. Come up
B. Stay unchanged
C. Remain unstable
D. Go down
Read the following passage and mark the letter A, B, C or D on your answer sheet to
indicate the correct word or phrase that best fits each of the numbered blanks
It has long been suspected that lack of sleep can actually lead to illness, particularly in
young people. Research involving students aged 14-19 over a three-week period now
appears to confirm (23) ……...
The teenagers wore devices that recorded the movements they made, without being
(24)... of them, that indicated they were asleep. The results were then compared to the
number of illnesses that they had (25)... from during the three weeks, in addition to
the number of occasions on which they had been absent from school.
What the study showed was that students who slept (26)... than seven hours a night
caught colds, flu and other relatively minor illnesses more often The problem is that as
children enter their teens their natural sleeping patterns change, (27) ………. in them
going to sleep later and therefore wanting to wake up later - but they still have to get up
in the morning to go to school.
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