Always read the      on the bottle carefully and take the right amount of medicine.

A．explanations

B．instructions

C．descriptions

D．Introductions

链球菌致病性胞外分泌物是（）

A.链激酶、链道酶、胞壁多糖、透明质酸酶

B.链激酶、链道酶、链球菌溶血素、透明质酸酶

C.透明质酸酶、胞壁多糖、链道酶、链球菌溶血素

D.链道酶、链球菌溶血素、黏附素、红疹毒素

E.红疹毒素、胞壁多糖、透明质酸酶、链激酶