题目内容
听力原文： One way that scientists can learn about man is by animals, such as mice, rats and monkeys. The scientists in this laboratory are experimenting on mice. They are studying the relationship between diet and health. At this time over 100 experiments are going on in this laboratory. In this experiment, the scientists are studying the relationship between the mount of food the mice eat and their health. The mice are in 3 groups. All the 3 groups are receiving the same healthy diet. But the amount of food that each group is receiving is different. The first group is eating I cup of food each day, the second is eating 2 cups, and the third group of mice is eating 3 cups. After 3 years, the healthiest group is the one that is only eating I cup of food each day. The mice in this group are thinner than normal mice. But they are more active. Also they are living longer. Mice usually live for 2 years. Most of the mice in this group are still alive after 3 years. The second group of mice is normal weight. They are healthy, too. They are active, but not as active as the thinner mice. But they are only living about 2 years. The last group of mice spend most of the day eating or sleeping. They are not very active. These mice are living longer than the scientists thought: about a year and a half. But they are not healthy. The experiment is still going on. The scientists hope to finish their studies in 2 years.
According to the passage, what animals are often used by scientists to learn about man？
查看答案
搜索结果不匹配？点我反馈
更多问题
Each company has many "publics" who should be able not only to recognize its name 【21】______ to correctly identify its industry and its 【22】______ . These publics include present customers and stockholders as well as banks, insurance companies, stockbrokers, and securities 【23】______ who supply the company with essential services and capital.
The 【24】______ names of many well-established companies can be one of misinformation, thereby 【25】______ communication with them. This was the problem that faced Michigan Seamless Tube Company—a company with sales of $128 million a year. At first 【26】______ ,the company's name tells us that it is located in Michigan 【27】______ that it manufactures seamless tubing. What the name does not 【28】______ to most people is the fact Michigan Seamless Tube also has operations in five 【29】______ states and has a varied production line of forgings, broaching machines, tools, and steel bars in addition to seamless tubing. The problem was 【30】______ by the company's 【31】______ , which operated. 【32】______ their own names and were not clearly identified with the 【33】______ company.
Customers, suppliers, and the financial community did not see Michigan Seamless Tube as a 【34】______ based metal producer. They perceived it only as a small, 【35】______ , regional manufacturing company. The company's 【36】______ decided to adopt a new corporate identity.
The 【37】______ point for this change was the company name. The new name had to be one that could encompass all of the company's products and subsidiaries, a name that would correctly project the image of a 【38】______ corporation. After considering many different possibilities, management decided on a 【39】______ word: Quanex—a name 【40】______ from a combination of the first three letters of the word "quality" and the first three letters of the Latin word "nex", which means connection.
【21】
听力原文： Good evening. You are listening to Pop World of BCD International. I'm Sally Brown. Today, we are going to hear Several current hits of the world's most popular artists.
Well, at the beginning, I would like to say a few words to my dear listeners who are not very familiar with this program.
Because many people want to listen to and understand pop songs, radio producers at BCD International have made hundreds of programs over the years. We not only have access to the stars of the music world, but have a vast library of "golden oldish" Classics, as well as the "latest releases".
For those of yon who like a bit of background with your favorite music--there's The History of Pop and The Road to Music. These two series bring you the language of pop music and information about the periods and the artists.
If you want to hear from the artists themselves, there's a new series called About the Big Hits. This is based on interviews with popular singers and songwriters. They speak to us about the meanings and ideas behind their songs.
If you want to understand the words to the big music hits, Pop Words is the program for you. After all, it's hard enough for native English speakers to understand most pop songs--so, if English isn't your first language, you shouldn't be surprised if the words to many songs leave you in the dark. It was to address exactly this problem that BCD International started broadcasting Pop Words just over 23 years ago...
Which of the following is covered in BCD International programs？
The old buildings blend with the new ones in perfect ______, so a walk along Huaihai Road
PART C
Directions: You will hear three dialogues or monologues. Before listening to each one, you will have 5 seconds to read each of the questions which accompany it. While listening, answer each question by choosing A, B, C or D. After listening, you will have 10 seconds to check your answer to each question. You will hear each piece ONLY ONCE.
听力原文： A million people came to London on May 9 to watch 16 000 people run 26 miles. The event was the London Marathon, which looked like one of the fastest growing sports in the 1980s.
70 000 people had applied to take part in the race, but the numbers had to be restricted to 16 000 for safety reasons. Running through a big and friendly crowd which lined the whole course, the competitors followed a route which took them through the center of London, finishing near the House of Parliament.
Well, they weren't really competitors. The fastest man finished in 2 hours 9 minutes, and the fastest woman in 2 hours 29 minutes--hat most people weren't trying to beat the clock, they were just interested in seeing if they could actually run 26 miles.
However, one of the runners collapsed 50 meters from the end. The crowd yelled encouragement and applauded as three times he tried to stand up--and three times fell down. Then, on his fourth attempt, he managed to stand up, and finished the race. Another was so exhausted that he crossed the finish line on his hands and knees.
How many people applied but didn't run the race？
微信支付 
支付宝支付