A:呼吸、循环、泌尿、神经
B:消化、泌尿、内分泌、循环
C:循环、消化、呼吸、泌尿
D:神经、消化、呼吸、循环
At last, we ______ the top of the mountain and enjoyed the beautiful scenery (景色)there.
秦始皇说:“天下共苦,战斗不休,以有侯王。赖宗庙,天下初定,又复立国,是树兵也,而求其宁息,岂不难哉。”秦始皇为解决上述问题而采取的措施是( )
am, is, are