Part Ⅱ Proofreading and Error Correction (15 min) （改错）?
The hunter-gatherer tribes that today live as our prehistoric 1.___?
human ancestors consume primarily a vegetable diet supplementing 2.___?
with animal foods. An analysis of 58 societies of modem hunter-?
gatherers, including the Kung of southern Africa, revealed that one ?
half emphasizegathering plant foods, one-third concentrate on fishing?
and only one-sixth are primarily hunters. Overall, two-thirds?
and more of the hunter-gatherer's calories come from plants. Detailed 3.___?
studies of the Kung by the food scientists at the University of?
London, showed that gathering is a more productive source of food?
than is hunting. An hour of hunting yields in average about 100 4.___?
edible calories, as an hour of gathering produces 240. 5.___?
Plant foods provide for 60 percent to 80 percent of the Kung 6.___?
diet, and no one goes hungry when the hunt fails. Interestingly, if?
they escape fatal infections or accidents, these contemporary?
aborigines live to old ages despite of the absence of medical care. 7.___?
They experience no obesity, no middle-aged spread, little dental?
decay, no high blood pressure, on heart disease, and their blood?
cholesterol levels are very low( about half of the average American 8.___?
adult), if no one is suggesting what we return to an aboriginal life 9.___?
style, we certainly could use their eating habits as a model for 10.___?
healthier diet.?
答案：
1.答案：as→like?
【详细解答】as our prehistoric human ancestors意为"作为人类史前的祖先那样"，但是 根据上下文，此处应表达的意思是"像人类史前的祖先那样"，故应该将as改为介词like。?
2.答案：supplementing→supplemented ?
【详细解答】本句中的分词短语supplementing with animal foods 是定语，修饰 vegetable diet，根据上下文，此处是指"素食被肉食补充"，故应该用过去分词表被动。?
3.答案：and→or ?
【详细解答】根据上下文，这里的意思只能是三分之二或多于三分之二，所以不能用表示并列 关系的and，而应该用表示选择关系的or。?
4.答案：in→on ?
【详细解答】on average为固定搭配，意为"平均"。?
5.答案：as→whereas/while ?
【详细解答】根据上下文意思，这两句话表示的是一种对比关系。故应该改用连词whereas或w hile，引出相反或不同的事实。?
6.答案：for ?
【详细解答】provide是及物动词，可以直接连宾语，不需要任何介词。?
7.答案：of?
【详细解答】despite是一介词，其后可直接接名词。?
8.答案：half∧→that ?
【详细解答】在这里加上that，用来指代前面的blood cholesterol levels，句子结构才完整。?
9.答案：if→though ?
【详细解答】根据上下文，这里的主从句关系不是条件，而是让步关系，即"尽管没有人建议 我们回到土著人的生活方式，..."。?
10.答案：for ∧→a ?
【详细解答】本句中的a healthier diet表示一种更加健康的饮食。冠词a泛指"一种或一类"。