当原溶液为非理想型较强的物系，则加入萃取剂主要起（）作用。
参考答案：稀释
Everyone _____________ happy on Sundays. [ ]
A. are
B. is
C. does
The boy is not particular about food and always eats ________ his parents give him.[ ]
A. no matter what
B. whichever
C. no matter which
D. whatever
