為了有效避免上述錯誤再次發生，現整理Distinguish & Compare的IB官方定義、IB生物菌總結的近十年考題呈現分值、滿分答題要求及考查能力如下（詳見清單一）

題目要求比較的對象是“生長素在控制組和NPA處理組莖基中的濃度變化”，比較的是兩者的趨勢變化，而甲同學比較的對象是“生長素在控制組和NPA處理組莖基中濃度”，比較的是兩者的絕對值，而非趨勢變化！這樣類似的審題錯誤在IB生物菌閱卷過程中屢屢出現。

乙同學盡管做到了比較趨勢變化，但卻把比較的對象誤當成“生長素在控制組和NPA處理組在第六片葉子和莖基中的濃度變化”，莫名地把兩者比較理解成了四者比較，也是審題不清的一種表現。

最后IB生物菌羅列了閱卷過程中發現的五個Compare and Contrast題常見錯誤，只要成功越過這五個“大坑”，滿分就不是問題啦！（詳見清單三）

清單三（Compare and Contrast題常見錯誤）

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.

參考答案

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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