制曲所用原料的成分指标中更加关注的是（   ）的含量。
A、 淀粉
B、水分
C、蛋白质
D、碳水化合物

单项选择题‌‏在逆流吸收过程中，操作液气比增大，操作线与平衡线之间的距离（ ）。‏ A、减小 B、增大 C、不变 D、不确定

单项选择题Filling blanks with the right indefinite or definite articles: Interactional competency is ______ ability to communicate with others. Piano is _____ type of musical instrument which consists with strings and keys. Culture is _____ set of features and variables that define a group of community.