【正确答案】 B

【答案解析】rarely：很少。seldom也有这个意思。She seldom shows her feelings．她很少流露自己的感情。frequently：经常。She frequently attends academic meetings．她经常参加学术会议。usually：通常。Influenza usually breaks out in winter,流感常在冬天爆发。normally：正常地。