“I’m certainly more and more to the conclusion that Iraq has, ___they maintained（断言）, destroyed almost all of _____ they had in the summer of 1991.” Bill said.
A. which, what B. as, which C. as, that D. as, what
高二英语单项填空中等难度题
“I’m certainly more and more to the conclusion that Iraq has, ___they maintained（断言）, destroyed almost all of _____ they had in the summer of 1991.” Bill said.
A. which, what B. as, which C. as, that D. as, what
高二英语单项填空中等难度题查看答案及解析
“I’m certainly more and more to the conclusion that Iraq has, ___they maintained（断言）, destroyed almost all of _____ they had in the summer of 1991.” Blix said.
| A．which, what | B．as, which | C．as, that | D．as, what |
高二英语单项填空简单题查看答案及解析
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
The two men discussed and came to ____________ conclusion that the helicopter would take _______________ place of the car some day.
A. /; / B. a; the C. a; / D. /; the
高二英语单项填空中等难度题查看答案及解析
They also agree that it is the burning of more and more fossil fuels that has resulted ____ this increase in carbon dioxide.
A．from B．of C．in D．to
高二英语单项填空中等难度题查看答案及解析
Belt and Road project has been on smoothly, ______ has led to more nations joining.
A.that B.which C.what D.it
高二英语单项填空中等难度题查看答案及解析
It’s certain that we are ________ to having a clean and beautiful home in the future because some special projects are ________ to protect the environment.
A. under way; on the way B. in the way; on the way
C. on the way; by the way D. on the way; under way
高二英语单项填空中等难度题查看答案及解析
The fact has worried us more and more students have got near-sighted.
A. what B. which C. that D. though
高二英语单项填空中等难度题查看答案及解析
It is widely believed that China has been into a more prosperous and advanced country in the last century.
A. transformed B. transferred
C. shifted D. transmitted
高二英语单项填空困难题查看答案及解析