Question

A recent study of ancient and modern elephants has come up with the unexpected conclusion that the African elephant is divided into two distinct (不同的) species

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 Asian elephant, African forest elephant and African savanna elephant

Once they obtained DNA sequences (序列) from two fossils (化石)，mammoths and mastodons the team compared them with DNA from modern 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 divergence of the two species took place around the time of the divergence of Asian elephants and woolly mammoths. This result amazed all the scientists.

There has long been 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 proof lay 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 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 (優(yōu)先)for conservation purpose .”

1.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

2.The underlined word “divergence” in paragraph 4means “________”

A. evolution B. exhibition C. separation D. examination

3.The researcher’s conclusion was based on a study of the African elephant’s ____________

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

4.What were Alfred Roca’s words mainly about?

A. The conversation of African elephants.

B. The purpose of studying African elephants

C. The way to divide African elephants into two units

D. The reason for the distinction of African elephants

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

A. Naturalist’s Belief about Elephants.

B. Amazing Experiment about Elephants

C. An Unexpected Finding about Elephants

D. A Long scientific Debate about Elephants

 

Answer 1

1.D

2.C

3.A

4.A

5.C

【解析】

試題分析：本文主要介紹關(guān)于大象的最新研究成果，非洲大象被分成兩種完成不同的品種，非洲草原大象和非洲森林大象；

1.D 細節(jié)理解題。根據(jù)第三段提到Once they obtained DNA sequences (序列) from two fossils (化石)，mammoths and mastodons the team compared them with DNA from modern elephants.可知選D項。

2.C 詞義猜測題。根據(jù)第四段提到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.可知科學家已證實，非洲的草原大象與非洲的森林大象幾百萬年來不屬于同一品種，要吧推斷下句話為兩種大學的分離應發(fā)生在。。。，故選C項。

3.A 細節(jié)理解題。根據(jù)第三段提到Once they obtained DNA sequences (序列) from two fossils (化石)，mammoths and mastodons the team compared them with DNA from modern elephants. They found to their amazement that modern forest and savanna elephants are as distinct from each other as Asian elephants and mammoths可知判斷研究者結(jié)論是建立 在對非洲大象的DNA的研究結(jié)果的基礎(chǔ)上的，故選A項。

4.A 推斷題。根據(jù)最后一段提到Now that we know the forest and savanna elephants are two very distinct animals, the forest elephant should become a bigger priority (優(yōu)先)for conservation purpose可知他的講話是圍繞著對非洲大象的保護開展的，故選A項。

5.C 主旨大意。根據(jù)第一段可知，本文主要介紹關(guān)于非洲大象的最新研究成虹，非洲草原大象和非洲森林大象兩個完成不同的品種，故選C項。

考點：科普類閱讀。