北师大版高中英语Unit12 Lesson4：And in Sydney, you'll find a broad choice of opera, drama, classical concerts, rock concerts -- there's too much choice really!

在本句中，第一个choice是可数名词，表示“在多个选项时，作出选择的一次行为”。而第二个choice是不可数名词，表示“可供选择的机会”。

例如：新牛津英汉双解大词典

■an act of selecting or making a decision when faced with two or more possibilities
选择；抉择
the choice between good and evil. 善恶间的抉择。

■[mass noun]the right or ability to make, or possibility of making, such a selection
选择权；选择能力；可供选择的机会
I  had to do it, I had no choice.没有选择，我必须做。

■a range of possibilities from which one or more may be selected
选择范围
you can have a sofa made to order in a choice of over forty fabrics.
你可以定做一只沙发，有40多种面料可供选择。

■a course of action, thing, or person which is selected or decided upon
选中的行动步骤；入选物；入选者
this disk drive is the perfect choice for your computer. 这个磁盘驱动器是你电脑的完美选择。