Li Bing of Qin in the Spring and Autumn Period; ② Located in the middle reaches of Minjiang River; (3) the famous water transport project; (4) eliminate floods and irrigate farmland.

A①②③④ B②③④ C①②④ D②④

38, the world's earliest millet is (B)

A, Beijinger B, Banpo aborigine C, Neanderthal D, Hemudu aborigine

39, the emergence of private property of the original residents in China and the polarization between the rich and the poor is (C).

A, caveman B, Hemudu C, Dawenkou D, Banpo

40, the following historical facts, marks the China from hereditary system to abdication system is (C).

A, Yu Chuanwei Boyi B, Shun Chuanwei Yu C, Yu Chuanzi, Jia Tianxia D, Qi defeated You Hu.