ADSL技术的承载实体通常是()
A、电话线路A
解析： ADSL 使用比较复杂的调制解调技术，在普通的电话线路进行高速的数据传输。选项 A 符合题意，故选择 A 选项。
Thetwinshadbeenawayforsuchalongtimethatmanypeopleinthevillagethoughtthey________.
Thisisanimportantproblem_______toofewsocialscientistshaveresearched.
WenotefromyourletterofSeptember10ththatyouareinterested____walnutmeat.
RobertFrostisgenerallyconsideredaregionalpoetwhosesubjectmattersmainlyfocusonthelandscapeandpeoplein().
Totrade____thepeopleofalleountries____thebasisofequalityandmutualbenefitisourestablishedpolicy.
