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Passage2      Questions 6 to 10 are based on the following passage.      Most of us are used to seasons.Each year, spring follows winter, which follows autumn,which follows autumn, which follows spring.And winter is colder than summer.But the earth goes through temperature cycles over much longer periods than those that we experience.Between 65,000 and 35,000 years ago, the planet was much colder than it is now.During that time the temperature also changed a lot, with period.s of warming and cooling.Ice melted during the warm.periods, which made sea levels rise.Water froze again during the cold periods.      (77) A new study from Switzerland sheds light on where ice sheets melted during the ice age.It now seems that the ice melted at both ends of the earth, rather than just in either northern or southern regions.      This surprised the researchers from the University of Bern.(78) Scientists have long assumed that most of the ice that melted was in the Northern hemisphere(半球) during the 30,000-year long ice age.That belief was held because the North Pole is surrounded by land,while the South Pole is surrounded by the Antarctic Ocean.It is easier for ice sheets to grow on land.If surrounded by sea the ice can easily just slip into the ocean instead of building up.      The researchers used a computer model to look at ways the ice could melt and how it might affect sea levels.They compared these results to evidence of how temperatures and currents actually changed during that time.The model showed that if it was only in the Northern hemisphere that ice melted, there would have been a bigger impact(影响) on ocean currents(洋流) and sea temperatures than what actually happened.Studies suggest that melting just in the Southern hemisphere would have been impossible, too.The only reasonable conclusion, the scientists could make, was that ice melted equally in the North and the South.      It is still a mystery as to what caused the temperature changes that caused the ice to melt.
Passage1      Questions 1 to 5 are based on the following passage.      We find that bright children are rarely held back by mixed-ability teaching.On the contrary,both their knowledge and experience are enriched.We feel that there are many disadvantages in streaming(按智力划分) pupils.It does not take into account the fact that children develop at different rates.It can have a bad effect on both the bright and the not-so-bright child.After all,  it can be quite discouraging to be at the bottom of the top grade !      Besides, it is rather unreal to grade pupils just according to their intellectual ability.This is only one aspect of their total personality.(76) We are concerned to develop the abilities of all our pupils to the full,not just their academic ability.We also value personal qualities and social skills,and we find that mixed-ability teaching contributes to all these aspects of learning.      In our classrooms, we work in various ways.The pupils often work in groups: this gives them the opportunity to learn to cooperate, to share, and to develop leadership skills.They also learn how to cope with personal problems as well as learning how to think, to make decisions, to analyze and evaluate, and.to communicate effectively.The pupils learn from each other as well as from the teacher.     Sometimes the pupils work in pairs; sometimes they work on individual tasks and assignments, and they can do this at their own speed.They also have some formal class teaching when this is appropriate.We encourage our pupils to use the library, and we teach them the skills they need in order to do this efficiently.An advanced pupil can do advanced work:   it does not matter what age the child is.We expect our pupils to do their best, not their least, and we give them every encouragement to attain this goal.