题目内容：
Students will need ___21___ all of their language skills in order ___22___ understand the read—ing selections in Reader's Choice．The book contains many types of selection on a wide varietyof topics．These selections provide practice ___23___ using different reading strategies to extractthe message of the writer．They also give students practice in four ___24___ reading skiUs：skim-ming，scanning，reading for___25___comprehension，and critical reading． Skimming is quick reading for the general ideas of a passage.This kind of rapid reading is___26___ when you are trying to decide if careful reading is desirable or when there is not time toread something carefully．
Like skimming，___27___is also quick reading．However，in this case the search is more___28___．To scan is to read 29 in order to locate specific information，when you read to find a particulardate，or number you are scanning．
Reading for thorough comprehension is ___30___ reading in order to understand the totalmeaning of the passage． ___31___ this level of comprehension the rea(ter is able to summarize theauthor’s ideas but has not ___32___ made a critical evaluation of those ideas．
Critical reading demands that a reader ___33___ iudgments about what he or she reads．Thiskind of reading requires posting and ___34___ questions such as“Does my own experience sup—port ___35___ 0f the author?”，“Do I share the author's point of view? ”and“Am I convinced bythe author's arrangements and evidence?”
根据以上内容，回答题。
A．used
B．using
C．to use
D．use
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答案解析：