【单选题】【消耗次数：1】
问卷法的优点表现在：抽样范围较广，令被调查者有充分地考虑时间，不受别人干扰，（ ）。
①
时间、经费比直接调查访问较为经济
②
成本较高
③
时间较长
④
样本差异较大
参考答案：
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