A.they are very rare
B.they often cause loss of life
C.they always occur in big cities
D.they arouse the interest of all the readers
3.According to passage， the chemical accident that caused by the fault of management happened at ____.
A.Texas city
B.Flixborough
C.Seveso
D.Mexico City
4.From the passage we know that ammonium nitrate is a kind of ____.
A.natural gas， which can easily catch fire
B.fertilizer， which can‘t be stored in a great quantity
C.poisonous substance， which can’t be used in overcrowded areas
D.fuel， which is stored in large tanks
5.From the discussion among some experts we may coclude that ____.
A.to avoid any accidents we should not repair the facilities in chemical industry
B.the local authorities should not be concerned with the production of the chemical industry
C.all these accidents could have been avoided or controlled if effective measure had been taken
D.natural gas stored in very large tanks is always safe
答案：DBABC