28. Why are rats used in the new research project? A. They are smarter than dogs. B. They are more curious. C. They are more popular than dogs. D. They can reach smaller spaces.29. What is the purpose of the new research project? A. To make a comparison. B. To help rescue ...
Why do scientists study rats?Rats are often used by scientists to learn more about diseases and medicine.What's so special about rats? This new research shows that a Norway rat has morethan 25,000 genes (基因) and about 90 percent of those genes are just like the onesyou'd find in mi...
Yes, I think snakes are useful. Snakes play an important role in the natural world. They help to keep the populations of certain prey species, such as mice and rats, under control. In addition, snake venom has been used in medical research to develop drugs to treat human diseases. 蛇在...
Mice are also used in behavioral, sensory, aging, nutrition and genetic studies.E. Mice and rats are also relatively inexpensive.F. But Sinclair insists that even if research on mice is sometimes unsuccessful, they're the best we've got.G. This helps make the results of medical trials ...
In one research study, two groups of young rats were raised under different conditions. One group developed in an “enriched” environment, which allowed the rats to interact with other rats, play with toys, and receive maze training. The other group lived in an “impoverished” environment in...
Did you know that in China, various meat markets sell raw and clean rat meat, which can be used for various dishes? Summary Rats with tails are enjoying their lives more than tailless ones. Their tails help them a lot in surviving during extreme weather conditions. No wonder, they can br...
D.Because rats are very brave. 40.Which is the best title of this passage? A.Ways of saving people B.Rats and robots C.After earthquake D. Rats for rescue 答案 36.B 根据第二段 a new research project is using a smaller animal to save lives:the rat知,老鼠可以帮助救援人员找到幸 ...
“Cats are not the natural enemy of rats,” says Michael Parsons of Fordham University, New York. “They prefer smaller prey.” His team1(study) a rat colony at a recycling plant in New York in the past few years. When cats moved into the plant last year, the researchers were disappoi...
For example, 20-wk-old rats undernourished at birth had elevated concentrations of gluconeogenic enzymes, which might promote increased carbohydrate oxidation relative to fat oxidation (17). Although we studied children living in Brazil, it is important to note that children in other countries are ...
Even though the undernourished rats are more sedentary when kept in standard laboratory cages (Vickers et al., 2003), their behaviour differs in another striking way from the control animals. When given a choice between pressing a lever to obtain food and running in a wheel, they are ...