例题4(1997年8月考试试题)Unlike fossil fuels, which can be used only once, wind and solar power _____of energy.(A) for renewable sources(B) the sources are renewable(C) are renewable sources(D) renewable sources这里,句子的主干应该是wind and solar power____ of energy.Unlike fossil fuels表示比较,做状语。而which引导的从句which can be used only once修饰fossil fuels.大家将4个选项分别代入句子主干的空格中,得(A) wind and solar power for renewable sources of energy选项A没主语,即没完整的主谓结构。(B) wind and solar power the sources are renewable of energy非常明显,这也不可以构成一个完整的有意义的句子。(C) wind and solar power are renewable sources of energy这个选项比较合适,由于主谓齐全,而且以名词sources结尾,让介词短语of energy修饰。(D) wind and solar power renewable sources of energy非常明显,这也不可以构成一个完整的主谓结构。所以,正确答案是C?例题5(1997年8月考试试题)Today _____ of the Earth live on a very small percentage of the Earth's land surface.(A) about two-thirds populated(B) the population is about two-thirds(C) about two-thirds of the population(D) of about two-thirds the population is第一,剖析句子结构。依据句子的大意,动词live应该是主句的谓语动词。空格填入的应该是句子的主语,而a very small percentage of修饰限定the Earth's land surface.大家简化这个句子,得出句子主干_____ live on the Earth's land surface.空格内应该填入名词或者名词短语。4个选项中,只有C是明显的名词短语,代入后也符合句意。选项A中的populated不论是做定语还是谓语都不符合句意。而选项B和D都是带有助动词的主谓结构,当然不可以填入只缺主语的句子中。所以,正确答案是C.?例题6(1997年8月考试试题)Following the guidelines for speaking and voting established by the book Robert's Rules of Order, _____during meetings.(A) and avoid large decision-making organizations' procedural confusion(B) large decision-making organizations avoid procedural confusion(C) is procedural confusion avoided by large decision-making organizations(D) are avoiding procedural confusion in large decision-making organizations第一,大家剖析following将来空格以前句子的成分。其中的established by the book Robert's Rules of Order和for speaking and voting都修饰the guideline.所以,大家可以将空格前的成分简化为following the guidelines.那样这个时候,原句成为Following the guidelines, _____ during meeting.和例题3一样,following the guidelines不是做定语(随着状语)就是做谓语。假如它做定语,后面需要带自然语序的主谓结构;假如它做谓语,后面需要带倒装的主谓结构。由此,大家排除带有and的选项A.依据句意(guidelines和confusion的意思)大家又可以排除选项C.这个时候,大家只剩下选项B和D.选项D是主谓倒装的结构,填入后主语应该是avoiding procedural confusion,谓语动词是are.非常明显,avoiding procedural confusion后应跟单数谓语动词。所以D也错,只有B才可能是正确答案。代入句中,符合句意。?例题7(1997年8月考试试题)Because it was so closely related to communication, _____ art form to develop.(A) drawing was probably the earliest(B) to draw early was probably(C) early drawing probably(D) the earliest draw.第一,大家剖析句子结构。空格前是because引导是什么原因状语从句,也就是说,_____art form to develop应该是完整的主谓结构。而单数的art暗示它应该是修饰名词form,不定式to develop做补语。所以,空格内应填入完整的主谓结构。这个时候,大家可以排除选项C和D,剩下选项A和B.仔细对比选项A和B,大家发现选项A更符合句意,由于drawing这个名词(画)才可能是一种艺术形式(art form),而动作to draw不可能是一种艺术形式。所以,正确答案是A。