I was still sleeping when the fire ________, and then it spread quickly.
A:broke out
B:put out
C:came out
D:got out
C+O2 点燃__ CO2 2H2+O2 点燃__ 2H2O 4P+5O2 点燃__ 2P2O5
找出它们的共同点,并写出其中两点.
____;____.
象——____——____ 巩——____——____
黑——____——____ 成——____——____