猩红热的发热和皮疹是由哪种物质引起
A．红疹毒素
B．溶血素"O"
C．透明质酸酶
D．链激酶
E．脂壁酸
参考答案：A
My grandma told me ______ interesting story yesterday. ______ story was about a foolish man. [ ]
A. an; A
B. a; The
C. an; The
D. a; a
孵化效率
