题目内容

The boy is fond of playing games and wants to be a programmer.

A. one who supervises a project
B. one who organizes activities
C. one who creates computer programs

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This method is applicable to a variety of problems.

A. able to be used
B. able to be solved
C. able to be changed

I had to plow through a stack of letters in the office for the whole day.

A. browse quickly
B. finish with great effort
C. write in reply

String a = "Hello"; 则执行a.replace("e","f")后a的内容为_____.(答案只写字符串的内容，不用加双引号)

String a = "123"; 则执行a.concat("456")后a的内容为_______。(答案只写字符串的内容，不用加双引号)