干货丨IB-DP生物数据分析题应考策略（三） Distinguish & Compare

为了有效避免上述错误再次发生，现整理Distinguish & Compare的IB官方定义、IB生物菌总结的近十年考题呈现分值、满分答题要求及考查能力如下（详见清单一）

题目要求比较的对象是“生长素在控制组和NPA处理组茎基中的浓度变化”，比较的是两者的趋势变化，而甲同学比较的对象是“生长素在控制组和NPA处理组茎基中浓度”，比较的是两者的绝对值，而非趋势变化！这样类似的审题错误在IB生物菌阅卷过程中屡屡出现。

乙同学尽管做到了比较趋势变化，但却把比较的对象误当成“生长素在控制组和NPA处理组在第六片叶子和茎基中的浓度变化”，莫名地把两者比较理解成了四者比较，也是审题不清的一种表现。

最后IB生物菌罗列了阅卷过程中发现的五个Compare and Contrast题常见错误，只要成功越过这五个“大坑”，满分就不是问题啦！（详见清单三）

清单三（Compare and Contrast题常见错误）

A few years later, a third study used a treatment with umbilical cord stem cells on patients who had suffered from moderate or severe type I diabetes for an average of 8 years. They were divided into two groups: group 1 had moderate diabetes and group 2 had severe diabetes. The patients’ blood was circulated outside the body and exposed to umbilical cord stem cells before returning to the patients’ circulation. The control group had moderate diabetes and received the same treatment but without umbilical cord stem cells.

Question：Compare and contrast the results of the treatment on group 1 with the results of the treatment on group 2.

参考答案

Similarities:

C-peptide increases after treatment in bothgroups

or treatment effective in both groups

or both groups rose higher than the control

or Similar/same overall/total increase «inboth groups».

Differences:

Smallerpercentage increase «pre to post treatment» in group 1 «than group 2»

or Initial increase is greater in group 1

or increases slowing/finished/rate ofincrease reduced by end of study/by week 24 in group 1 but continuing in group2

or Group 1 rose above lower limit «by week12» and group 2 remained below it «even at week 24»

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