The man ______the conclusion with the _____ev...

The man ______the conclusion with the _____evidence and presented it at the conference.

A. come to; supporting

B. came to; supported

C. draw; supported

D. drew; supporting

高二英语单项填空中等难度题查看答案及解析

The research lacks　　　　　 evidence，and therefore，its conclusions are doubtful.

A．solid　　 B．fierce　　 C．severe　　 D．potential

高二英语单项填空中等难度题查看答案及解析

The research lacks ________evidence, and therefore, its conclusions are doubtful.

A．solid             B．fierce            C．severe            D．potential

高二英语单项填空中等难度题查看答案及解析

_________ enough evidence, the police gave up charging the man with murder.

A．Absent from　　 B．Rich in

C．Because of　　　　 D．In the absence of

高二英语单项填空中等难度题查看答案及解析

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 (优先)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

高二英语阅读理解中等难度题查看答案及解析

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 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.”

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 researchers’ conclusion was based on a study of the African elephant’s _____.

A. DNA　　　　　 B. height

C. weight　　 D. population

3.What are Alfred Roca’s words mainly about?

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.

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

A. Naturalists’ Beliefs about Elephants

B. Amazing Experiments about Elephants

C. An Unexpected Finding about Elephants

D. A Long Scientific Debate about Elephants

高二英语阅读理解中等难度题查看答案及解析

New evidence might lead to the conclusion ______ the young woman is lying.

A. whether　　　　 B. if　　　　 C. why　　　　 D. that

高二英语单项填空中等难度题查看答案及解析

The police failed to come up with ______ evidence, and on that account the suspect was released.

A. effective                B. valid            C. subtle        D. considerate

高二英语单项填空简单题查看答案及解析

The police failed to come up with ______ evidence, and on that account the suspect was released.

A. effective                B. valid            C. subtle      D. considerate

高二英语单项填空简单题查看答案及解析

For the first time, a generation of children is going through adolescence with smartphones ever-present. Jean Twenge , a professor of psychology at San Diego State University, has a name for these young people born between 1995 and 2012："iGen". She says, “Members of this generation are physically safer than those who came before them. They drink less they learn to drive later. " "But psychologically," she argues, "they far more easily get hurt. It's not an overstatement to describe iGen as being on the edge of the worst mental health crisis in decades.''

Today's teens are just not spending as much time with their friends face-to-face where they can really read each others' emotions and get that social support. And we know from lots of research that spending time with other people in person is one of the best predictors for psychological well-being and one of the best protections against having mental health issues. They're more likely than young people just 5 or 10 years ago to say that they're anxious, and that they have symptoms of depression.

How much of a factor is parenting? “Parenting is playing a role. Many parents are worried about their teens driving, and going out with their friends and drinking. Yet parents are often not worrying about their teens who stay at home on their phones all the time. But they should be worried about that. I think parents are worried about the wrong thing," Professor Twenge remarked.

She proposes several helpful solutions, "The first is just awareness that spending a lot of time on the phone is not harmless and that if you're spending a lot of time on the phone, then it may take away time from activities that might be more beneficial for psychological well being, like spending time with people in person. And then for parents, I think it is a good idea to defer giving your child a smartphone as long as you can.”

1.What does iGen refer to according to the text?

A.Generation with high intelligence.

B.Generation in information age.

C.Physically strong generation.

D.Psychologically healthy generation.

2.How can today's teens avoid mental health crisis?

A.By making more friends online.

B.By seeing psychologists frequently.

C.By reading others' emotions constantly.

D.By communicating with friends face to face.

3.What should parents concern according to Professor Twenge?

A.Their teens' chatting with classmates.

B.Their teens' poor school performance.

C.Their teens' addiction to smart phones.

D.Their teens' staying out with their friends.

4.Which can best replace the underlined word “defer" in the last paragraph?

A.Put off. B.Approve of.

C.Think of. D.Insist on.

高二英语阅读理解中等难度题查看答案及解析