When something is on fire, people throw sand on it to put out the fire. The main use of the sand is to _________. 
#54333
A
protect the thing on fire
B
add weigh to the thing on fire
C
keep the air away from the thing on fire
D
lower the temperature of the thing on fire
推荐题目
How many states _______ the United States? Fifty. 
#57159
A
turn up
B
make up
C
end up
D
give up
 The boy doesn’t know how to _________ English words in a dictionary.
#59545
A
look up
B
look after
C
look at
D
look for
 Whether we will hold the sports meet _____ the weather.
#52171
A
gets up
B
sets up
C
gets used to
D
depends upon
At the weekend I often go to the bookshop ________ new books.
#62919
A
look at
B
to have a look at
C
look for
D
to look on