【单选题】Don E. Crabtree was a master craftsman and a dean of American flintknappers. Crabtree's research is important because it pioneered the development of Experimental Archaeology and the application of li...
【简答题】阅读下面短文,从短文后所给各题的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。 To his parents’ disappointment, Andy was born with a disability. The two sides of his brain were not joined 21 to each other. The right side ...