下列哪一类细胞产生IgE（）
A.T淋巴细胞
B.B淋巴细胞
C.巨噬细胞
D.肥大细胞
E.嗜碱粒细胞
参考答案：B
下列属于氧化还原反应的是（ ）
A．CO2+H2O=H2CO3
B．H2CO3=CO2↑+H2O
C．2NaOH+H2SO4=Na2SO4+2H2O
D．C+O2 点燃 . CO2
The students are cleaning their classroom. ______ are cleaning the chairs.
And ______ are cleaning the windows. [ ]
A. Some; others
B. Some; another
C. Other; the others
D. Other; some
