CANBERRA(Reuters)—Australia’s kangaroos are genetically similar to humans and may have first evolved in China, Australian researchers said Tuesday.
Scientists said they had for the first time mapped the genetic code of the Australian marsupials(有袋类)and found much of it was similar to the genome for humans, the government backed Center of Excellence for Kangaroo Genomics said.
“There are a few differences, we have a few more of this, a few less of that, but they are the same genes and a lot of them are in the same order,”center Director Jenny Graves told reporters in Melbourne.
“We thought they’d be completely scrambled, but they’re not. There is great chunks of the human genome which is sitting right there in the kangaroo genome,” Graves said, according to AAP.
Humans and knagaroos last shared an ancestor at least 150 million years ago, the researchers found, while mice and humans separated and went in different ways from one another only 70 million years ago.
Kangaroos first evolved in China, but migrated across the America to Australia and Antarctica, they said.
“Kangaroos are hugely informative about what we were like 150 million years ago,” Graves said.
68.Where does the kangaroo first develop according the scientists?
A.In China. B.In America. C.In Australia. D.In Antarctica.
69.What does the passage mainly tell us?
A.How the Kangaroo first evolved. B.Kangaroo’ genetic code have been mapped.
C.Kangaroos’genes are close to humans’. D.Scientists did much research into Kangaroos.
70.What does the underlined word “scrambled” probably mean in the fourth paragraph?
A.Funny. B.Wrong. C.Curious. D.Right.
Something that makes sense is happening in Washington, D.C! Public school kids surrounded by museums and monuments are putting the ready-made learning tools to use — and actually learning.
A trip to see painter Jacob Lawrence’s Migration Series is one of almost 200 trips that Wheelock will organize this year through the nonprofit group Live It Learn It. “For many kids, school is disconnected,” says one of four full-time workers and tour leaders. “With the program, they see how what they are learning is connected to their communities.”
Seven years ago, Wheelock changed a job as a lawyer for one as a four-grade teacher. When he learned that D.C.’s public schools ranked behind those of other cities in many ways, he knew he had to do something different. He took his class to Capitol Hill for a lesson on the three branches of government — and saw his students’ interest develop quickly.
With seed money from a local couple, Wheelock developed detailed lesson plans for trips to the U.S. Holocaust Memorial Museum, the Lincoln Memorial. The group also has classes for trips to the Anacostia River, boat rides to historical forts. Word spread, and now fourth, fifth, sixth graders from the neediest public schools in the District participate.
“I’m not brave enough to take my class to a museum for over an hour!” says teacher Cathy McCoy, gesturing toward her students. “But look With Live It Learn It, what the kids learn today they’ll remember for a lifetime.” Matthew Wheelock once had an occupation as a _______.
| A．teacher | B．printer | C．leader | D．lawyer |
According to the first two paragraphs, public school kids in Washington D.C. _______.
A. like to have school disconnected
B. are warmly welcomed by museums and monuments
C. are making the resources at hand available
D. are learning by going to different communitiesMatthew Wheelock started the new change for the reason that _______.
A. he saw his students’ interest develop quickly
B. more graders from the neediest public schools wanted to participate
C. D.C.’s public schools ranked behind in many ways
D. a local couple sponsored him a sum of seed money What will the lessons be like with Live It Learn It in Cathy McCoy’s opinion?
| A．Eye-catching. | B．Challenging. | C．Forgettable. | D．Impressive. |
Teen Climbing Camp 2010
This 5-day climbing camp is suitable for teenagers between the ages of 13 and 18 who have an interest in rock climbing. The climbing days are designed for beginners and those who have some basic experience in a gym or outdoors. Participants will find themselves challenged physically and mentally.
Rock Dimensions camps are designed to be a positive and memorable experience by providing healthy communication between participants, individual goal setting, and challenges that lead to personal growth.
Dates
Monday, June 29-Friday, July 3
Monday, July 27-Friday, July 31
Locations
Climbing Tower at Footsloggers
Linville Gorge and Table Rock area
Local climbing areas near Boone
Responsibilities
Participants will meet Rock Dimensions guides at our location each morning and at the end of each day. Rock Dimensions will provide all climbing items, including a safety rope, a helmet and climbing shoes for each participant. Participants are responsible for bringing their own lunch, water, small backpack, appropriate clothing, and personal items like sun cream, etc.
Pre-camp planning
Participants will receive the following information in their registration(注册) packet Medical Form, Responsibility Agreement, Clothing/Equipment List, and Directions.
Cost
$575/person for the 5-day camp
$325/person for the first 3 days
Anyone interested in participating in just the last two days of the camp should call to discuss pricing and necessary skills/experience.According to the text, Rock Dimensions camps will _______.
| A．probably impress participants deeply |
| B．provide a few competitions |
| C．help the participants set their life goals |
| D．check the records of personal growth |
What of the following do participants need to bring with them?
| A．A safety rope. | B．A helmet. | C．Climbing shoes. | D．Appropriate clothing. |
If Paul wants to participate in the climbing camp from July 27 to July 29 and his brother from July 27 to July 31, it will cost them _______.
| A．575 dollars | B．650 dollars | C．900 dollars | D．1,150 dollars |
What can we infer from the text?
| A．Some experience is required of the participants. |
| B．It’ll be hard for teens to experience the climbing. |
| C．Parents are required to stay with their children. |
| D．Guides will talk about the prices with parents. |
How the Grand Canyon (大峡谷) was created remains one of the geology’s greatest mysteries. Some evidence suggests that the process was a gradual one in which the Colorado River (which runs through the canyon) slowly cut deeper and deeper into the ground over millions of years. But volcanic rock samples taken from the canyon now suggest that the canyon was down-cut instead.
Down-cutting is when a flood of water rushes over a landscape (地形) with enough force to cut deeply into the ground and leaves behind a canyon. Such a flood is usually released when a natural or man-made dam (堤坝) bursts.
Robert Webb, a research geologist, says natural dams seem to have formed and broken across the Colorado River several times during the last million years. The dams were built when lava(熔岩) from the eruptions of nearby volcanoes flowed into the river. The lava hardened into hard rocks and blocked the river, causing it to back up and form a lake. Each time the lake grew so huge that it broke the rock dam, releasing a flash flood that furthered the down-cutting process and deepened the canyon.
Down-cutting is not just an earthly event. Satellite photos sent back from Mars suggest that the process has happened there, too, say many other researchers.
The photos, taken by the Mars Global Surveyor, indicate that an enormous lake existed on Mars 3.5 billion years ago. The lake spilled into a large nearby hole. One edge of the hole broke, releasing a flash flood that quickly carved out a grand canyon.
The existence of down-cutting on Mars is just one more piece of evidence that the cold, dry planet was once warm and wet.In the past, deep canyons were believed to have formed _______.
| A．as a result of a sudden break of volcanoes |
| B．due to river flows over millions of years |
| C．owing to the burst of artificial dams |
| D．thanks to our ancestors’ creative work |
According to the passage, which of the following statements is TURE?
| A．Several volcanoes broke out on Mars directly creating grand canyons. |
| B．Several great lakes existed on the upper parts of the Colorado River. |
| C．People built high dams on the upper parts of the Colorado River. |
| D．The Colorado River crossed the Grand Canyon to form down-cutting. |
From the last three paragraphs we learn that _______.
| A．there are great lakes on Mars |
| B．there are active volcanoes on Mars |
| C．there might be cities on Mars |
| D．there might be life on Mars |
The passage can be titled as _______.
| A．Lakes on Earth and Mars |
| B．The Cause of Lake Formation |
| C．The Force of Dam Breaking |
| D．Canyons—Results of Flood Cutting |
A man, who sometimes takes my bus, is in rags. His life seems different from that of the others. He looks exhausted and carries nothing. He appears along a downtown street, seemingly out of nowhere. We sometimes want to know where he sleeps at night.
A few weeks ago he boarded the bus. A few stops later, a young woman boarded. She swiped (刷) her bus-card, only to find the machine would not accept it. The driver told her to pay the $2.25 fare. “I just bought this card,” she said. “I paid the money...”
The driver said she could take the card back to the sales office and explain the problem. In the meantime she would have to pay the fare for that day. The woman became confused and distressed. The rest of us just watched, wondering how the problem would be solved. Suddenly the man rose from his seat, dropped a few coins into the fare box.
“You’re lucky,” the bus driver said quietly. “He paid for you.” Silence fell over the bus. The rest of us had watched the woman’s discomfort, but he felt it. We lawyers, journalists and business people headed downtown to help fix the world. He fixed her world.
I haven’t seen him since that day. Some people believe angels occasionally drop down and move among us. All I know is that I have a new respect for the simple act of kindness. It speeds us along on our way.According to the first paragraph, the author _______.
| A．thinks highly of the man | B．often gives the man some help |
| C．knows the man very well | D．considers the man strange |
What does the underlined word “distressed” probably mean?
| A．exited | B．generous | C．bored | D．anxious |
What did the writer learn from the man?
| A．to show concern for other people. |
| B．to lead a happy life like the man. |
| C．to share what he has with us. |
| D．to believe that people are born kind. |
I was puzzled! Why was this old woman making such a fuss about an old copse（矮林） which was of no use to anybody? She had written letters to the local paper, even to a national, protesting about a projected by-pass to her village, and, looking at a map, the route was nowhere near where she lived and it wasn’t as if the area was attractive. I was more than puzzled, I was curious.
The enquiry into the route of the new by-pass to the village was due to take place shortly, and I wanted to know what it was that motivated her. So it was that I found myself knocking on a cottage door, being received by Mary Smith and then being taken for a walk to the woods. “I’ve always loved this place,” she said, “it has a lot of memories for me, and for others. We all used it. They called it ‘Lovers lane’. It’s not much of a lane, and it doesn’t go anywhere important, but that’s why we all came here. To be away from people, to be by ourselves. ” she added.
It was indeed pleasant that day and the songs of many birds could be heard. Squirrels watched from the branches, quite bold in their movements, obviously few people passed this way and they had nothing to fear. I could imagine the noise of vehicles passing through these peaceful woods when the by-pass was built, so I felt that she probably had something there but as I hold strong opinions about the needs of the community over-riding the opinions of private individuals, I said nothing. The village was quite a dangerous place because of the traffic especially for old people and children, their safety was more important to me than an old woman’s strange ideas.
“Take this tree,” she said pausing after a short while. “To you it is just that, a tree. Not unlike many others here.” She gently touched the bark, “Look here, under this branch, what can you see?”
“It looks as if someone has done a bit of carving with a knife.” I said after a cursory inspection.
“Yes, that’s what it is!” she said softly.
She went on, “He had a penknife with a spike for getting stones from a horse's hoof, and I helped him to carve them. We were very much in love, but he was going away, and could not tell me what he was involved in the army. I had guessed of course. It was the last evening we ever spent together, because he went away the next day, back to his Unit.”
Mary Smith was quiet for a while, then she sobbed. “His mother showed me the telegram. ‘Sergeant R Holmes …Killed in action in the invasion of France.’…”
“I had hoped that you and Robin would one day get married.” she said, “He was my only child, and I would have loved to be a Granny, they would have been such lovely babies’- she was like that! ”
“Two years later she too was dead. ‘Pneumonia (肺炎), following a chill on the chest’ was what the doctor said, but I think it was an old fashioned broken heart. A child would have helped both of us.”
There was a further pause. Mary Smith gently caressed the wounded tree, just as she would have caressed him. “And now they want to take our tree away from me.” Another quiet sob, then she turned to me. “I was young and pretty then, I could have had anybody, I wasn’t always the old woman you see here now. I had everything I wanted in life, a lovely man, health and a future to look forward to.”
She paused again and looked around. The breeze gently moved through the leaves with a sighing sound. “There were others, of course, but no one can match my Robin!” she said strongly. “And now I have nothing - except the memories this tree holds. If only I could get my hands on that awful man who writes in the paper about the value of the road they are going to build where we are standing now, I would tell him. Has he never loved, has he never lived, does he not know anything about memories? We were not the only ones, you know, I still meet some who came here as Robin and I did. Yes, I would tell him!”
I turned away, sick at heart.The main purpose of this passage is to ________.
| A．draw attention to the damage that wars cause |
| B．persuade people to give up private interest |
| C．arouse the awareness of being environmentally friendly |
| D．introduce a touching but sad love story |
Which of the following words can best describe Mary Smith?
| A．Selfish. | B．Faithful. | C．Changeable. | D．Stubborn. |
The underlined sentence “I felt that she probably had something there” means ________.
| A．I thought there might be something hidden in the woods by Mary Smith |
| B．I guessed there might be a story related with Mary Smith |
| C．I thought there might be some reason for Mary Smith’s protest |
| D．I guessed there might be a secret purpose of Mary Smith. |
What was probably the carving on the wounded tree?
| A．The date when Robin Holmes would leave for army. |
| B．Their wish that this place and tree would last long. |
| C．Their names and a heart with a sign of arrow through it. |
| D．Their protest against the war which tore them apart. |
In Mary’s opinion, which of the following might have caused Robin’s mother’s death?
| A．Pneumonia | B．A chill on the chest | C．A heart attack | D．Severe sorrow |
The “tree” probably stands for ________.
| A．her romance . | B．her determination | C．her sadness | D．her dream |