“换宝宝”的游戏是婴儿（）训练。
A.发音
B.克服认生
C.认物
D.认识颜色
参考答案：B
33．It was not until one night_____we were doing our cleaning-up I got curious and wanted to see what was on the top floor．
A．that；that
B．when；so
C．that；because
D．when；that
表示石油沥青的温度稳定性指标是（）。
A.针入度
B.粘滞度
C.延度
D.软化点
