下列各疾病中,属于传染病的是( )
A:蛔虫病和艾滋病
B:夜盲症和糖尿病
C:高血压和呆小症
D:甲亢病和贫血病
—I am really struck by your spoken English. You speak so fluently. Have you been abroad?
—Yes. I ______ in London for two years.