广东省佛山市2020-2021学年高二上学期期末考试+英语+PDF版无答案

lace, they found that the activity of both hemispheres (F#)of the brain was obviously diffcrent from normal in the early 1970s American women gave birth, on average, to 2. 12 children each. By 2018 In a new place, we sleep a little like some animals. One hemisphere falls asleep completely that number had fallen to 1.73. Jordan Nickerson and David Solomon, professors at MIT, think but the other remains alert(5 ) This is what happens with, for example, dolphins. In humans they have found an interesting factor which help explain this change: America's increasingly the second hemisphere also goes to sleep, but this is an unusually shallow slccp. This is in ordcr protective child car-seat laws Their study examines the effect that car-seat policies may have had on american birth rates to react to possible threats(E/)). Of course, in the majority of cases, we are not at risk of being During the 1980s, only the children aged under three had to be secured in child-safety seats.But torn apart