The _______ are the only people who still use pictographs in the world. A: Nu people B: Lisu people C: Naxi people D: Wa people

The Yi language branch include the following language except ( ). A: Naxi language B: Dai language C: Hani language D: Lisu language

NO7信令中第二功能级处理的信号单元是（）。 A: FISU B: LISU C: MSU D: LSSU