题目

Music is universal—it 1.           (produce) by all cultures. Some scientists believe that music came before speech. In fact, there is one theory that the 2           (early)languages were chanted or sung rather than spoken. Indeed, in some cultures, music is a form of 3.          (record) history. The Aboriginal Australians, for example, use music as 4.          means to pass on stories of the land and spirits to the next generation. New evidence suggests that music does not just satisfy the feel-good factor but it 5.          (be) als关于氧族元素下列说法中正确的是 [　　] A．其单质都既有氧化性，又有还原性 B．都可以形成－2、＋4、＋6价的化合物 C．都可以与直接化合形成稳定的氢化物 D．氢化物的水溶液都显酸性