quEstion 16
ChoosE thE CorrECt lEttErA,
B、orC、 quEstions 17-20
mAtCh thE toxiC gAs in thE Box to thE EFFECts BElow.
ChoosE your AnswErs From thE Box AnD writE thE lEttErsA-D、nExt to quEstions 17-20.
toxiC gAsEs
A．CArBon DioxiDE
B、nitrogEn oxiDE
C．CArBon monoxiDE
D．hyDrogEn sulphiDE