一、单项选择（共15小题；每小题1分，满分15分）从A、B、C、D四个选项中，选出可以填入空白处的最佳选项．
1．﹣﹣﹣Jim，do you think the washing machine is _______ useful invention？
﹣﹣﹣Yes．We will have to wash our clothes by_______ hand without it．（ ）
A．a，the B．an，the C．an，/ D．a，/
2．﹣﹣﹣It seems that your daughter shows an interest ______ playing the guitar．
﹣﹣﹣Exactly．Her teacher says she has a gift _______ music．（ ）
A．in，of B．in，for C．for，of D．for．In
3．﹣﹣﹣I'm afraid I have to give up my dream of being a dancer．
