单项选择题
A.Karen is very forgetful. B.He knows Karen better now. C.Karen is sure to pass the interview. D.The woman should have reminded Karen earlier.
A.Refrain from showing his feelings. B.Express his opinion frankly. C.Argue fiercely. D.Yell loudly.
A.Because they are not accustomed to it. B.Because they are not psychologically prepared for it. C.Because their genes differ from those who have been tested for it. D.Because they arc less sensitive to it than those who have been tested for it.