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II. Basic Listening Practice
1. Script
M: Scentists claim the world population has 99.5% of the same DNA.
W: But this doesn’t tell us there is no such thing as race.
Q: What is true of the DNA of difference races?
2. Script
W: With the advent of the genetic map we know where everything is, but do we know where to go with it?
M: Your map ems to differ largely from my geographical map!
Q: What does the man imply?
3. 立事Script
M: As you know, it has taken millions of years of evolution and natural lection to get us where we are today.
W: Yes, but now that we have genetic engineering, we em to have decided that we want to be God.
Q: What does the woman imply?
蒜苔炒什么好吃
4. Script弓步压腿正确姿势
M: I think the rearch into cloning will lead us into dangers, filling us with fal hopes of perfection.
W: It’s too late to turn back the clock. We’ll just have to depend on common n to solve uncommon problems.
Q: What does the woman mean?
5. Script
W: In America, many prisoners are having their cas reviewed, and some have even been freed through DNA testing.
M: Except for the ones who death ntence has already been carried out.
Q: What can we learn about DNA testing from the dialog?
Keys: 1.B 2.C 3.D 4.A 5.C
III. Listening In
Task 1: Stem Cell Rearch
Script
Gregory: The Republican party in America is opposing stem cell rearch. I find it
hard to believe that in this day and age, someone would do that.
Lillian: Stem cell rearch sounds pretty impressive, I’ll admit. But just what is it?
Gregory: Well, a stem cell is a special type of cell. It is a general cell that, when it
devides, can become any specific type of cell.
Lillian: You mean, a stem cell can become a heart cell? Or a brain or a kidney cell?
Gregory: That’s about it. Stem cells are a part of the body’s maintenance and repair
system. When they divide, they can become any cell type.
Lillian: I guess there would be some tremendous medical advantages in that sort of
rearch.
Gregory最流行主卧衣柜: You’ve said a mouthful. Recently, scientists were able to help a man who
lost a jawbone for cancer. They recreated bone material for his jaw from stem cells. What it means is that since the new bone was created out of the person’s own cells, ther
e was no problem with rejection becau the DNA was the same.
Lillian: I bet the person was delighted. Why would anyone oppo that sort of rearch? It would em to have endless potential to benefit the human race.
Gregory: I agree, but there are people who think we should not interfere with nature and manipulate “what is natural”.
Lillian: It’s easier to hold such a narrow view if you’re not in a position to need the benefits of the rearch. If you’re missing a jawbone becau of cancer, you probably support the rearch.考研几月份考试
1. What is the passage mainly about?
2. Who is against stem cell rearch?
3. What is special about a stem cell?
4. When can a stem cell become another cell type?
5. According to the passage, why do some people oppo stem cell rearch?
Keys: 1.B 2.A 3.A 4.A 5.D
Task 2: The Improvement of Rice
Script
Scientists now know a lot more about a grain that people have eaten for ten thousand years. (S1) Rearch teams around the world have completed a map of the (S2) 成熟女性图片genes自信的好处 of rices. The findings appeared last week in the (S3) journal Nature.
The aim is to speed up the improvement of rice. The scientists (S4) warn that the kinds of rice plants ud now have reached the limit of their (S5) productivity. Yet world rice production must (S6) grow by an estimated 30 percent in the next twenty to meet demand. By 2025, as many as 4.6 billion people will depend on rice for (S7) survival. There is a lot of pressure on breeders to improve the crop, and the rice genome is a valuable tool to do that. (S8) Plant breeders have already ud preliminary information fro
m the rice genome to create experimental strains of rice that better resist cold and pests非常喜悦.
The rearchers also say rice is an excellent choice for genetic mapping and engineering. Rice genes have only about 390 million chemical bas. That maight sound like a lot. But other major food grains have thousands of millions. (S9) The new map could better explain more than just rice. Rice shares a common ancestor with other cereal crops. Becau rice is the first cereal crop to be fully analyzed, rearchers expect that sufficient knowledge of its genetic information will reveal the heredity of more complex grains, including corn, wheat and barley.
