Scientists have put human brain cells(细胞) into the brains of baby rats, where the cells grewand formed connections.The research is part of an effort to study human brain development and diseases affecting(影响) the brain.
Scientists put human brain cells into baby rats that were two to three days old. Pasca,a professor at the Stanford School of Medicine. said this is the first time these cells have been placed into the brains of baby rats. At that age, brain connections are still forming. The cells grew so that they took up a third of the rat's brain.Neurons(神经元)from the cells formed working connections with the brain.
To examine how the idea might be useful for studying human health scientists put human brain cells into both sides of a rat's brain. One side had cells created from a healthy person and the other side had cells of a person with Timothy syndrome（蒂莫西综合症).Five to six months later.they saw the influence of the disease in the activity of the neurons. The neurons from the person with Timothy syndrome were much smaller and did not grow too much to pick up signals(信号)from nearby neurons.
The researchers said they could do the same kinds of experiments using the cells of people with disorderssuch asautism(自闭症).Such studies could help them learn new things about how these diseases affect the brain.
Dr Flora Vaccarino of Yale University said the study moves the field forward."What they do here is every valuable.It can help us better understand human brain development,"said Vaccarino,who was not in the study.
kinds of experiments using the cells of people with disorderssuch asautism(自闭症).Such studies could help them learn new things about how these diseases affect the brain.
Dr Flora Vaccarino of Yale University said the study moves the field forward."What they do here is every valuable.It can help us better understand human brain development,"said Vaccarino,who was not in the study.
1.What are the purposes of the research?① To treat human diseases.② To produce a powerful brain.③ To study human brain development.④ To study diseases affecting the brain.A. ①② B.②③C.③④ D.①④2.Why were baby rats chosen in the study?A. They are easy to control.B. They are usually healthier.C. Their brains are developing.D. They are more likely to survive.3.What was found in the experiment about Timothy syndrome?A. It can help produce more neurons.B. It can influence the activity of the neurons.C. The neurons from the person with it were much bigger.D. The neurons from the person with it were much healthier.4.What does the underlined word“disorders”in Paragraph 4 mean in Chinese?A. 秩序 B.疾病C.订单 D.体征5.What can we learn from Dr Flora Vaccarino's words?A. The study is of great value.B. He wants to join in the study.C. More studies are still needed.D. He feels a little disappointed.
1.C 细节理解题。根据第一段中的“The research is part of an effort to study human brain development and diseases affecting the brain.”可知，进行这项实验是为了研究人脑发育以及影响人脑的疾病，故选C项。2.C 推理判断题。根据第二段中的“At that age, brain connections are still forming.”可知，这个年龄段的幼鼠的大脑连接仍在形成，由此可推知，他们的大脑仍在发育，故选C项。3.B 细节理解题。根据第三段中的“Five to six months later, they saw the influence of the disease in the activity of the neurons.”可知，五到六个月后，科学家们看到了这种疾病对神经元活动的影响，由此可知，这种疾病可以影响神经元活动，故选B项。4.B 词义猜测题。根据第一段中的“The research is part of an effort to study human brain development and diseases affecting the brain.”可知,这一研究的目的之一是研究影响人脑的疾病；再根据空后的such as autism可知，此处指研究人员表示，他们可以用自闭症等疾病患者的细胞做同样的实验，故推测画线词意为“疾病”。5.A 推理判断题。根据最后一段第一句“Dr.Flora Vaccarino of Yale University said the studymoves the field forward.”可知，Vaccarino 认为这项研究推动了该领域的发展,再结合“What they do here is every valuable.”可知，他还认为这项研究很有价值，故选A项。长难句分析原句：（第一段第一句）Scientists have put human brain cells into the brains of baby rats,where the cells grew and formed connections.译文：科学家们将人脑细胞放入幼鼠的大脑中，细胞在那里生长，并形成了连接。分析：这是一个复合句。where the cells grew and formed connections为where引导的非限制性定语从句.补充说明the brains of baby rats。
