题型:阅读理解 题类:常考题 难易度:普通
北京四中2016-2017学年高二下学期英语期末考试试卷
With only about 1,000 pandas left in the world, China is desperately trying to clone the animal and save the endangered species. That's a move similar to what Texas A & M University researchers have been undertaking for the past five years in a project called "Noah's Ark".
Noah's Ark is aimed at collecting eggs, embryos (胚胎), semen and DNA of endangered animals and storing them in liquid nitrogen. If certain species should become extinct, Dr. Duane Kraemer, a professor in Texas A & M's College of Veterinary Medicine, says there would be enough of the basic building blocks to reintroduce the species in the future.
It is estimated that as many as 2,000 species of mammals, birds, reptiles will become extinct in over 100 years. The panda, native only to China, is in danger of becoming extinct in the next 25 years.
This week, Chinese scientists said they grew an embryo by introducing cells from a dead female panda into the egg cells of a Japanese white rabbit. They are now trying to implant the embryo into a host animal. The entire procedure could take from three to five years to complete.
"The nuclear transfer (核子移植) of one species to another is not easy, and the lack of available panda eggs could be a major problem," Kraemer believes. "They will probably have to do several hundred transfers to result in one pregnancy. It takes a long time and it's difficult, but this could be groundbreaking science if it works. They are certainly not putting any live pandas at risk, so it is worth the effort," adds Kraemer, who is one of the leaders of the Project at Texas A & M, the first-ever attempt at cloning a dog.
"They are trying to do something that's never been done, and this is very similar to our work in Noah's Ark. We're both trying to save animals that face extinction. I certainly appreciate their effort and there's a lot we can learn from what they are attempting to do. It's a research that is very much needed."
Here are some themed attractions inside this Disneyland Park that all have something to offer.
Mickey Avenue
Once you entered the Disneyland Park, Mickey Mouse and his friends gather along the street welcoming you. This place is also a busy bazaar where tourists can select varieties of goods and enjoy tasty snacks while wandering around.
Gardens of Imagination
It is the first garden-designed Disney park in the world, with bridges and paths connecting seven themed areas. Chinese Zodiac Mural (生肖壁画) in the Garden of the Twelve Friends turn the movie figures into twelve animal signs. Guests can try to find their own zodiac sign on the wall and take photos with it.
Adventure Isle
Adventure Isle takes visitors into a newfound ancient tribe(部落). Drifting down the river on the rafts, you will pass through unknown places and rush into the dark caves, meeting the huge mysterious monsters.
Tomorrowland
The carefully designed Tomorrowland presents endless possibilities of the future. Using high tech, this park is like the settings of science fiction movies. The shooting program, “Buzz lightyear Planet rescue”, gives visitors a mission to save the world.
Admission Fee
One-day Ticket | CNY370 on ordinary days CNY499 on weekends, public holidays, July and August |
Two-day Ticket | A 5% discount on the basis of the original prize |
Note:
Children between 1 and 1.4 meters tall and seniors aged over 65 can enjoy a 25% discount on the ticket price.
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