普通话音节响亮、悦耳，原因是音节中元音占优势。
唐朝皇帝的机要秘书机构是（） ["翰林学士院","南书房","内阁","军机处"]
分析米勒的《拾穗者》。
我国客运列车的列车管定压为（）。 ["500kPa","600kPa","700kPa","800kPa"]
The（）approach to language study is concerned with language as an instrument of social interaction rather than as a system that is viewed in isolation.
塑料护套线在同一墙面转弯时，必须保持相互垂直，弯曲导线要均匀，弯曲半径不应小于塑料护套线宽度的（）倍
