单项选择题
His use of color, light and form quickly departed from the conventional style of his （）as he developed his own technique.
A．descendants B．predecessors C．successors D．ancestors
单项选择题 It is hard to tell whether we are going to have a boom in the economy or a （）
单项选择题 The （）from childhood to adulthood is always a critical time for everybody.
单项选择题 If you want this painkiller, you'll have to ask the doctor for a （）
