帧同步保持收发信机工作于同一比特率，其他二级同步保证对收信端输出的数字序列进行正确的分组。
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0wing____unusualshortageofstock,thisofferismade,subjecttothegoodsbeingunsold.
ThePortraitofALadyisgenerallyconsideredtobe()masterpiece,whichdescribesthelifejourneyofanAmerican()inaEuropeanculturalenvironment.
WhenyouwereinLondon,didyouvisit________________Tower,too?
Intheoriginaltest，alltheanimalsinatestgrouparegivenasubstance_______halfofthemdie
InclassifyingtheEnglishconsonantsandvowels,thesamecriteriacanbeapplied.