Part 2
For questions 13-27, read the text below and think of the word which best fits each gap. Use only
one word in each gap. There is an example at the beginning (0)
Write your answers IN CAPITAL LETTERS on the separate answer sheet.
Example: 0 BY
Mosquitoes
mosquitoes, affects
According to the World Health Organisation, malaria, a disease spread (0)
millions of people every year. Everyone knows how irritating the noise made by a mosquito,
........ is known about
(13) by a painful reaction to its bite, can be. It is astonishing that so (14)
level of distress and
why mosquitoes are drawn to or driven away from people, given (15)
disease caused by these insects. We know that the most effective chemical (16) protecting
deel. (18)
people against mosquitoes is diethyltoluamide, commonly shortened (17)
works well, it has some serious drawbacks: it can damage clothes and some people are allergic to it.
deet
Scientists know that mosquitoes find some people more attractive than others, but they do not know
(19) ........ this should be. They also know that people vary in (20)
reactions to mosquito bites.
who is bitten by the same mosquito (22)
discovered the reason for this, but they have carried
by, certain smells.
One person has a painful swelling while (21)
hardly notice. Scientists have (23)
(24) experiments to show that mosquitoes are attracted to, or put (25)
In the future, scientists hope to develop a smell that mosquitoes cannot resist. This could be used in
a trap (26) that, instead of attacking people, mosquitoes would fly into the trap and be
destroyed. For the time (27) however, we have to continue spraying ourselves with unpleasant
liquids if we want to avoid getting bitten.
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