资料：It’s easy to trace the evolution of the automobile.At most，we’re only talking about a few centuri

资料：It’s easy to trace the evolution of the automobile.At most，we’re only talking about a few centuries of technological development，and most of the plans，prototypes and models are still around. With just a little research，you can easily trace the latest model electric hybrid back to its steam-powered ancestors.Your family tree is probably a different matter. Even an extensive genealogy chart can only reach back so far，and mortality puts a rather strict limit on exactly how many “models” are still on the road. Humanity’s evolutionary progression is even more difficult. We still have plenty of living primate relatives，but many of the life forms that connect the evolutionary dots are long extinct.Evolutionary biologists use several methods to decipher exactly how we came to be as we are.In fact，the field itself encompasses several different disciplines in addition to biology，like genetics，psychology，geology，archaeology linguistics，anthropology and primatology just to name a few. Naturally，paleoanthropology also plays a key role，as we have to turn to the fossil record for many clues about our ancient primate，human and nearly human ancestors.While the fossil record by its very nature is incomplete，there’s no shortage of fossil evidence to link the planet’s varied life forms into a great tree of life， a chart that scientists call a phylogenetic tree. You can think of humans as the very tip of just one branch on that tree called “hominid.” Chimpanzees exist at the end of an adjoining branch called “panin.” Follow both the hominid and panin branch back about 5.4 million years， and you’ll find a point where scientists think the two converged from a single，common ancestor.Fossil evidence helps scientists to reconstruct these trees，but so do morphological and genetic studlies. Genetic analysis has yielded striking similarities between chimps and humans. As such， scientists know a last common ancestor of chimps and humans existed，even if we’ve yet to determine the exact species. Yet paleoanthropologists have found numerous hominid fossils to bridge the evolutionary progression from that unknown common ancestor to modern humans. These finds include such famous East African fossils as Lucy（Australopithecus afarensis），which strengthened the importance of bipedalism in human evolution and proved an essential milestone on our way to modern Homo sapiens.Fossil evidence for human evolution will never be complete，as fossils themselves are rare geologic occurrences.Nevertheless，by incorporating other scientific disciplines，we’re able to build an increasingly accurate picture of just what our evolutionary family tree consisted of.It can be inferred in Para.1 that taking example of tracting electric hybrid is to illustrate that.
A：how technological development over a few centuries developed.
B：how the plans，prototypes and models of electric hybrid developed.
C：how to trace family tree is much the same way astracing electric hybrid.
D：why humanity’s evolutionary progression is even more difficult.
D
题目意为“从第一段可以推断出，作者举追踪汽车发展的例子是为了说明？”选项A意为“几个世纪以来技术是如何发展的”，选项B意为“电动混合动力汽车的计划、原型和模型是如何发展的”，选项C意为“如何像追踪电动混合动力汽车一样追踪族谱”，选项D意为“为何人类进化进程更难”。根据主题句和下文，整篇文章主要说明追溯人类起源是很复杂和困难的，第一段举追溯汽车发展是容易的例子正是为了引出下文，与追诉人类起源艰难作对比，
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