题目

二次函数y=x–2x–3图象如图2所示．当y＜0时，自变量x的取值范围是（   ）                                 A、–1＜x＜3    B、x＜–1     C、 x＞3      D、x＜–1或x＞3                                 答案：A2. (2014 •贵州释西南) He could play the violin when he was five.(选出同义项)    A. at the age of five   B. five years later   C. for five years   D. five years age