It’s such an ________ film that all the students are ______ in it.

A．interesting; interested

B．interested; interesting

C．interesting; interesting

D．interested; interested; interested

限用一种试剂，经过一次性实验就能鉴别Na₂CO₃、(NH₄)₂SO₄、NH₄Cl、KNO₃溶液，应选用

A．AgNO₃溶液

B．NaOH溶液

C．Ba(OH)₂溶液

D．盐酸