单项选择题
A．can be found in any library B．can be read directly from the Internet C．can be read by any one who has a computer D．can be read when special software is installed
A．Husband and wife． B．Nurse and patient． C．Teacher and student． D．Boss and employee．
A．To show the receipt. B．To call the store first. C．To pay some more money: D．To bring the instruction manual.