应用电解原理，在金属或非金属表面，镀上一层其他金属的过程，叫（）。电镀中，通常将镀件金属作（）极，用含有（）离子的溶液作电解质。
参考答案：电镀；阴、欲镀金属
He is taller than he ________.
A．used
B．used to be
C．used to
D．used to do
----Li Feng won the first prize in the national English competition.
----Oh, really? I’m glad that his hard work at last _____.
A．worked out
B．got back
C．paid off
D．turned out
