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同学你好～
16:It is extremely useful in dealing with difficult olives（which often produce a lot of     16  ）   （due to the high content of solidmatters.）粗体是你需要注意的关键词（尤其是空前后的词）能帮助你定位，括号是帮助你看懂句子的结构。
回到原文：These olivesare easy to recognize because they produce a lot of extra foam during the stirring process 粗体是出现的关键词，和题目中的用的词是一摸一样的哦～这里的难点是these代之difficult olives，这个前文提及了Difficult olives are those that are more reluctant than the norm to yield up their full oil content. 这句中的oil和solid 是同义词。

19，20:Because it cannot     19     But adding talc powder can absorb the emulsifier and increase the production, because the size of oil     20     grows. 粗体帮助定位
19题的难点在于要读懂整个句子，But adding talc powder can absorb the emulsifier and increase the production的意思是但是加入..可以加速这个过程，这个过程就是19的空的内容啦 说明原来过程肯定很慢“may take some time to biodegrade”。

20:这里答案的意思是“因为油滴的大小在增大because the size of oil droplets  grows.”
根据原文“if you add between a half and two per cent of talc by weight during the stirring process, it absorbs the natural emulsifier in the olives and so boosts the amount of oil you can extract”，可知答案为droplets。这没有出现原词，考试时少见这样情况，不用担心哈～
加油哦～