题目内容

6.They've moved to a different house _____ their children can attend a better school.(  )
A.in caseB.as long asC.so thatD.even though

分析 他们搬到了另外的一个家为的是孩子能够上一所更好的学校.

解答 答案:C.
分析前后的两个句子可知,搬家的目的是为了孩子更好的就读,所以后面应该是一个目的状语从句,所以用so that来引导目的状语从句;in case和as long as引导条件状语从句;even though引导让步状语从句;故选C.

点评 对于状语从句的使用要理解清楚句子的意思,搞明白句型结构再作判断,要分清是什么状语从句.

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15.A recent study of ancient and modem 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 modem 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 than with DNA from modem elephants.They found to their amazement that modem 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 elephant and the African forest elephant 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 3.5 metres while the forest elephant has an average shoulder height of 2.5 metres.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 Illinois,said,"We now have to treat the forest and savanna elephants as two different units for conservation purposes.Since 1950,all African elephants have been conserved as one species.Now that we know the forest and savanna elephants are two very distinctive animals,the forest elephant should become a bigger priority(优先)for conservation purposes."
46.One of the fossils studied by the researchers is that ofD.
A.the Asian elephant                       B.the forest elephant
C.the savanna elephant                     D.the mastodon elephant.
47.The underlined word"divergence"in Paragraph 4 means"C."
A.evolution      B.exhibition             C.separation       D.examination
48.The researchers'conclusion was based on a study of the African elephantsA
A.DNA        B.height                 C.weight          D.population
49.What are Alfred Roca's words mainly about?A
A.The conservation 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.
50.Which of the following can be the best title for the passage?C
A.Naturalists'Beliefs about Elephants
B.Amazing Experiments about Elephants
C.An Unexpected Finding about Elephants
D.A Long Scientific Debate about Elephants.

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