课时同步（重大版）高一上英语必修2Unit2-2

White has always been a s________ of purity in Western cultures.
During the strong wind the ships stayed in the h________.
Crime figures are rising r________.
I have no l________ relatives.
The best defense is to a________.
Will you settle down ________(永久地) in America?
We managed to ________(引起；唤起) Mary to the dangerous situation she was in.
Many writers ________(模仿) the language of Shakespeare.
The government has imposed ________(限制) on imports.
The teacher explained the text ________(简单地)．

完成句子
____________________________(爱的光芒照到了我身上) on that very day.
I was simply ______________________________(模仿老师做的事)．
But ___________________________________(老师和我呆了几周后我才明白) that everything has a name.
That living word ________________________(唤醒了我的灵魂)，gave it light，hope，joy and set it free!
I lay in bed _________________________________________(在这重要的一天就要结束时)．

The human race has already paid a heavy price for its slow        to environment threats.

The coach asked his staff to      the large group of journalists, waiting for him to announce his training plan.

At the railway station, the mother waved goodbye to her daughter until the train was           .

IF you leave the club , you will not be          back in.

Jenny nearly missed the flight _____doing too much shopping.
B. on top of
C. in front of
D. in need of

We        the difficulty together, but why didn't you tell me?
B. might face
C. could have faced
D. must have faced

Had they known what was coming next, they________ second thoughts.

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

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

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

What were Alfred Roca’s words mainly about?

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