YDS PARAGRAF DOLDURMA / TEST 3 40. Soru

40.

........ . In poorly ventilated buildings,
chemical vapours emitted by furnishings
and building products can build up, as can
fumes from smoking, cooking and heating.
Airtight, energy-efficient houses and other
buildings can make the problem worse.
Moreover, the health risks are increased by
the fact that most people spend 80 to 90
percent of their time indoors.