2016闵行区高中一模解析之阅读B篇

发布时间：2016-01-15

作者：高考项目部

来源于：昂立外语网站

(B)

牛刀小试

A recent study of ancient and modern elephants has come up with the unexpected conclusion that the African elephant is divided into two distinctspecies. The discovery was made by researchers at York and Harvard universities when they were examining the genetic relationship between the ancient woolly mammoth and mastodon to modern elephants—the Asianelephant, African forest elephant and African savanna(热带草原)elephant.

Once they obtained DNA sequences(序列) from two fossils，mammoths and mastodons，the team compared them with DNA frommodern elephants.They found to their amazement that modern forest and savanna elephants are as distinct from each other as Asian elephants and mammoths.

The scientists used detailed genetic analysis to prove that the African savanna elephants and the African forest elephants have been distinct species for several million years. The separation of the two species took place around the time of the separation of Asian elephants and woolly mammoths.This result amazed all the scientists.
There has long been a debate in the scientific community that the two might be separate species but this is the most convincing scientific evidence so far that they are indeed different species.

Previously, many naturalists believed that African savanna elephants and African forest elephants were two populations of the same species despite the elephants’ significant size differences.The savanna elephant has an average shoulder height of 3.5metres while the forest elephant has an average shoulder height of 2.5metres.The savanna elephant weighs between six and seven tons, roughly double the weight of the forest elephant. But the fact that they look so different does not necessarily mean they are different species.However, the prooflay in the analysis of the DNA.

Alfred Roca, assistant professor in the department of Animal Sciences at the University of Minois, said, “We now have to treat the forest and savanna elephants as two different units for conservation (保护) purpose. Since 1950 all African elephants have been conserved as one species. Now that we know the forest and savanna elephants are two very distinct animals, the forest elephant should become a bigger priority for conservation purpose.”

70. One of the fossils studied by the researchers is that of ________.

A. the Asian elephant B. the forest elephant

C. the savanna elephant D. the mastodon elephant

71. The researcher’s conclusion was based on a study of the African elephant’s ________.

A. DNA B. height C. weight D. population

72. Alfred Roca’s words were mainly about ________.

A. the purpose of studying African elephants

B. the conservation of African elephants

C. the way to divide African elephants into two units

D. the reason for the distinction of African elephants

73. Which of the following can be the best title for the passage?

A. Naturalist’s Belief about Elephants.