This passage mainly talks about __________ .

• A、the tools made by "Flores Human" 

• B、the language used by "Flores Human"

• C、the evolution of "Flores Human" 

• D、the major surprising findings about "Flores Human"

57 （）

Shopping underground is clean __________.

• A、without air pollution

• B、of water 

• C、and tidy 

• D、and beautiful