单项选择题
A:Hello.Could I speak to Linda?B:Speaking.A:（）.
A.How do you do? B.Hi,Linda.This is Burt. C.Glad to hear your voice. D.Fine,that's good.
单项选择题 A:Would you father watch TV or go for a walk? B:The TV program is good today.（）. A:Cool.Lets go.
单项选择题 The basic causes are unknown though certain conditions that may lead to cancer have been（）.
单项选择题 If I had not been enjoying the work,I（）so much of it.
