问句阅读的东东

Hunting is at best a precarious way of procuring food ,even when the diet is supplemented with seeds and fruits.

the author mentions " seeds and fruits " in  line 2 as examples of

a. the first crops cultivated by early agricultural societies.

b.foods eaten by hunters and gatherers as a secondary food source

c.types of food that hunters and gatherers  lacked in their diets

d.the most common foods cultivated by early agricultural societies.

这个是不是要给出原文啊

虽然是词汇题

但是肯定和上下文有联系的

新东方TOEFL阅读的58篇啊，这个是全文的第一句话来的。其实是不懂 at best 和even when 到底那个是主要来源

Not long after the last Ice Age.around 7,000, BC.,some hunters and gatherers began to rely chiefly on agriculture for their sustenance.Others continued the old pastoral and nomadic ways. Indeed ,agricluture itself evolved over the course of time,and Neolithic peoples had long known how to grow crops.The real transformation of human life occurred when huge numbers of people bgan to rely primarily and permanently on the grain they grew and the animals they domesticated.