( )If people keep killing animals,I think it will -- nature.

( )If people keep killing animals,I think it will __ nature.
A .do harmfully to B ,be harmless to C.do harmful to D ,do harm to( )The weather in Guangzhou __ in Beijing.A .are difficult from it B .are different from that C .is different from that D .is difficult from that( )The police can't tell __ the suspect is the murderer or not.A .if B .from C .that D .whether