Rome was not built in a day. You should set ____ goals and work hard to achieve them.

A．alternative

B．considerable

C．subjective

D．realistic

以下哪种情况，客户需要办理小灵通补卡换卡。（）

A.小灵通手机坏了，重购新机

B.小灵通卡坏了，无法拨出电话

C.客户小灵通被盗

D.客户小灵通办理我的e家