课时作业(十五) Unit 4 Astronomy：the science of the stars Section Ⅲ Learning about Language & Using Language Ⅰ.单句语法填空 1．—What does the model plane look like? —Well，the wings of the plane are more than twice the_____(long) of its body. 2．Look！There is something strange_____(float) on the water. 3．A man came in and put a big vase on the table _____(gentle)． 4．It is well?known that Newton was a famous_____(physics)． 5．_____(like) most people in the office who come to work by car，I usually come to work by bus. 6．We live in a____ (globe) village，but this doesn’t mean that we all behave in the same way. 7．—Do remember watch out _____cars while crossing the street. —Got it. 8．_____(cheerful) up！You must believe in yourself and you will get success. 9．—What do you think of French? —In my opinion，French is as difficult a subject_____English. 10．Students should find more time to get close _____nature which can encourage their creativity. Ⅱ.阅读理解 A Some_people are like homing pigeons：Drop them off anywhere，and they’ll find their way around.Other people，though，can’t tell when they’re holding a map upside down.Are the directionally challenged just bad learners? Not all of your navigational (导航的) skills are learned.Research shows that your sense of direction is innate.An innate ability is something you are born with.Your brain has special navigational neurons—head?direction cells，place cells，and grid cells (网格细胞)—and they help program your inside compass (指南针) when you’re just a baby. In 2010，scientists carried out an experiment to study baby rats’ neural activity in their brains.Although the rats were newborns，the researchers discovered that their head?direction cells (which help them recognize the direction they’re facing) were fully grown and developed.The rats，it seemed，were born with a sense of direction.And they hadn’t even opened their eyes yet! Humans，of course，are not rats.But the hippocampus—the brain area we use for navigation—is similar in most mammals (哺乳动物)．If the rat’s compass develops this way，then it’s likely that a human’s compass does，too. If we’re born with a sense of direction，then why are some people so good at getting lost？The scientists found that the two other cells—place and grid cells—developed within the first month.Place cells are thought to help us form a map in our mind，while grid cells help us navigate new and unfamiliar places.The two cells work together，and that’s where the trouble might be. People who took part in a 2013 study played a video game that required them to travel quickly between different places.Monitoring (监测) their brains，the scientists found that grid cells helped the gamers recognize where they were—even without landmarks.According to researcher Michael Kahana，differences in how grid cells work may help explain why some people have a better sense of direction than others. 1．The underlined words “Some people” refe ... ...
