To make our city more beautiful, we should protect our environment. So don’t drop litter everywhere. Which of the following signs means “No littering”? ()
A. B. C. D. E. 1．Sign __________ means we can’t park here. 2．We can make signs __________ for lost animals. 3．Sign __________ tells you not to cross the street. 4．If we want to wash our cars, we should look for sign __________. 5．When we see sign __________, we should drive slowly and watch out for animals.
B. 
C. 
D. 
E. 
搜索
