题目

He likes to playhis friends.  A.with                        B.on                             C.to                             D.of 答案：A play with为固定搭配，意为“和……玩”。实验室用下列溶质配制一种混合溶液，已知溶液中C(K+)=C(Cl-)=1/2C(Na+)=C(SO42-)，则其溶质可能是 [     ]A．KCl、Na2SO4 　B．KCl、Na2SO4、NaCl C．NaCl、Na2SO4、K2SO4D．KCl、K2SO4、Na2SO4