(安徽省马鞍山二中2009届高三第四次模拟考试E篇)
John Dalton was born in England in 1766，ten years before the U．S．Declaration of Independence was signed．His family lived in a small cottage．As a small child，John worked in the fields with his brother，and helped his father in a shop where they wove cloth. Most poor boys at that time received no education，but John was lucky to attend a nearby school In 1766，when only about one out of every 200 people could read．
John was a good student and loved learning．His teachers encouraged him to study many things when he was twelve. He opened his first school in a nearby town，but there was little money．He had to close his schoo1．
Three years later，he joined his older brother and a friend in running a school. John studied the weather and nature around him. He collected butterflies，snails and mites. He discovered he was colorblind and studied that,too．
In 1793，John began to think about different elements and their composition. He had a theory that each element is made up of identical(完全相同的) atoms and that elements are different because each is made of different atoms．
In 1808，Dalton published a book，which listed the atomic weights of many known elements．These formed the basis for the modern periodic table(元素周期表)．Not everyone accepted Dalton’ theory of atomic structure at the time．However，he had to defend it with more research．
When John Dalton died in 1844，he was buried with honors in England．More 400,000 people viewed his body as it lay in state．As his final experiment，he asked that an autopsy(验尸)be performed to learn the cause of his color-blindness：This was done，and proved the color-blindness was caused not by a problem with his eyes，but with the way his brain worked．Even in death, he helped expand scientific knowledge．
Today．scientists everywhere accept Dalton’s theory of atomic structure．A simple country boy showed the world a new way of thinking about the universe and how it is made．
73．John Dalton’s first school had to be closed mainly because___________．
A．he was color-blind
B．his family lived in a small cottage
C．he had hardly enough money to run I
D．he lacked experience
74．Which of the following descriptions about John Dalton is wrong?
A．John found a cure for color-blindness
B．As a student，John was outstanding
C．John used to help with farm work
D．In his book，presentation of the atomic weight of many known elements was of great importance.
75．From the passage we may conclude that______．
A．John Dalton’s only contribution to science was his achievement in chemistry
B．as a great educator，John Dalton established the basis for education in England
C．John Dalton’s book about the elements enjoyed great popularity then
D．John Dalton devoted his entire life to science
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(安徽省马鞍山二中2009届高三第四次模拟考试D篇)
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 a 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(灭绝), 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 and 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(移植) the embryo into a host animal.
The entire procedure（程序） 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 (having a baby). 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.”
69. The aim of “Noah’s Ark” project is to _______.
A. make efforts to clone the endangered pandas
B. save endangered animals from dying out
C. collect DNA of endangered animals to study
D. transfer the nuclear of one animal to another
70. According to Professor Kraemer, the major problem in cloning pandas would be the lack of _______.
A. available panda eggs B. host animals
C. qualified researchers D. enough money
71. From the passage we know that _______.
A. Kraemer and his team have succeeded in cloning a dog
B. scientists try to implant(移植) a panda’s egg into a rabbit
C. Kraemer will work with Chinese scientists in clone researches
D. about two thousand of species will probably die out in a century
72. Which of the following should be the best title for the passage?
A. China’s Success in Pandas Cloning.
B. The First Cloned Panda in the World.
C. Exploring the Possibility to Clone Pandas.
D. China —the Native Place of Pandas Forever.
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