A:O
B:N
C:Cu
D:F
下列说法不正确的是( )
中国农业从远古洪荒走来,经历了“刀耕火种”、“牛耕铁犁”等阶段。下列项中属于“刀耕火种”阶段的耕作工具有( )
①石斧 ②耧车③骨镰 ④曲柄锄
There were __________ many horrible smells _______ I can't stay here more than one minute.