问题
单项选择题
The most important ______ of the farmers in Iraq is dates, of which Iraq is the world's leading exporter.
A．economic crop
B．cash crop
C．money crop
D．staple
答案
参考答案：B
解析：[分析] 固定搭配。 A．economic crop不这样用，“经济作物”应为cash crop；C．money crop不符合英语习惯；D．staple主要产品(或商品)，原材料。另：a food crop粮食作物，an oil-bearing crop油料作物。