单项选择题
After a number of disagreements with the committee， the chairman decided to （）.
A.resign B.retire C.retreat D.withdraw
单项选择题 Itisreportedthatthereisnobetter（）formother’smilk.
单项选择题 Theclassneedsamonitor（）.
单项选择题 Oneshouldneverloseheartwhen（）withtemporarydifficulties.
