摘要:
(1) (a) 34159 is not a prime number. (b) Not all roses are red or not all vialets are blue. (c) If there are no hamburgers, I'll not have a hot dog. ( 阅读全文
摘要:
(1) (a). (b). (c). (d). (e). (2) (a). T (b). T (c). T (d). F (e). F (f). F (g). T (h). T (i). T 阅读全文