-----Tony said he could fix my bicycle, but I really doubt it.

----- _____.He’s good at that sort of thing.

A．Don’t worry

B．Of course

C．A piece of cake

D．I couldn’t agree more

每次进行焰色反应时，所用铂丝都要用试剂洗涤，这种试剂是（  ）

A．稀盐酸

B．碳酸钠溶液

C．硫酸

D．氢氧化钾溶液