二、主题思想应能恰如其分地概括文中所阐述的内容。面不能太窄，即：不足以
概括全部内容；但是面也不能太宽，即：包含了文中没有阐述的内容。 例四：
Directions:Readthefollowingpassageandchoosethebestcentralthought
SugarhistoryintheHawaiianIslandsisfilledwithpioneering.Insailingshipd
ays,Hawaiiansugargrowersweremanymonthsfromsourcesofsuppliesandfrommar kets.ThisisolationbuiltupamongtheHawaiiangrowersanenduringspiritofcoo
peration.Growerssharedwithoneanotherimprovementsinproduction.Withoutg overnmentaidofanysort,theybuiltgreatirrigationprojects.Withoutgovernm
enthelp,theysetuptheirownresearchandexperimentorganization.Pioneering togetherovertheyears,theyhaveprovidedHawaiiwithitslargestindustry.
(A)Insailingdays,Hawaiiansugargrowersweremanymonthsawayfromsuppliesan dmarkets.(B)Hawaiiansugargrowersbuilttheirgreatindustrywithoutgovernmenthelp.
(C)Hawaiiansugargrowershavesetuptheirownresearchorganizationandhavesh aredimprovements.
(D)Bypioneeringtogether,sugargrowershaveprovidedHawaiiwithitslargesti ndustry.
(A),(B)  和(C)项只是文中提到的各项具体内容，作为主题思想面太窄了，只有
(D)项才概括了全文要说明的问题，因此，(D)是该文的主题思想。
要求抓主题思想的另一种形式是为短文选择合适的标题，因为短文的标题常常也 体现它所围绕的主题或讨论的中心。因此，为短文选择标题实际上也反映了对主
题思想的掌握。