问答题

Below is a table showing the killers in every 100 deaths in a city during the last three decades. Look at the graph and write an essay of about 120 words making reference to the following points:
1) the distribution of killers in different decades and the general trend in these decades
2) the possible reasons for the distribution of these killers in the city
Killers in Every 100 Deaths

Period	Cancer	Heart disease	Traffic Accidents	Other Causes
1970s	21	16	7	38
1980s	28	26	15	31
1990s	27	27	21	25

THIS IS THE END OF THE TEST.