蝇传播疾病的主要方式是
A.增殖式
B.机械性传播.
C.经卵传递式
D.发育式
E.发育增殖式
参考答案:B
28. The teacher said “______ you work hard and have a good way, all of you will succeed.”
A.If
B.Although
C.Though
D.Before
简述周代的“史官文化”。