【单选题】独立平面直角坐标系中,一般x轴指向( )。
【多选题】烟花爆竹行业安全事故频发的主要原因( )
【简答题】Match the English with its equivalents of Chines
【单选题】English became the official language for business __ the fact that the population was largely Chinese.
【单选题】(Either) of these young teachers (are) perfectly (qualified) (to teach) English and Chinese.