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 does Jack usually go to school? — He _____ ride a bike, but now he ______ there to lose weight.
#55104
A
used to; is used to walk
B
was used to; is used to walking
C
was used to; is used to walk
D
used to; is used to walking
Don 't ask him to study too late into the night . _____ ,  he is only a small child. 
#52678
A
As a result
B
Best of all
C
After all
D
For example
Can you help me ________my child? Ok.  
#59309
A
look at
B
look for
C
look after
D
look like