单选题
Skimming is one of the major types of selective reading. It differs from normal reading ______ not all of the material is read.
【正确答案】
A
【答案解析】[解析] 本题考查介词+关系代词的用法。表达“在阅读中”只能用介词in，故排除C、D项，再根据句子意思，横线后半句是表达原因，解释上半句话。in which是表示定语从句，但不符合这种因果关系，而in that相当于because，故选A。