燃油通气系统的功用是（）。
A.让燃油挥发以免发生爆炸
B.防火
C.防微生物
D.使油箱的压力接近环境压力
参考答案：D
— Michael has a temperature, so he isn't able to come.
— ____.[ ]
A. I'm sorry to hear that.
B. I'm disappointed.
C. Good luck.
D. Take it easy.
