车间空气中汞的最高允许浓度是（）。 A.0.015mg/m3 B.0.02mg/m3

A: Hi, Jack. You were not at school yesterday. 1.________
B: Oh, I had a headache and I had to ask for a sick leave.
A: Sorry to hear that. 2.________
B: Yes, my mother took me to the hospital. The doctor looked me over and said I had caught a cold.
A: 3.________
B: Yes, a little. The doctor told me to take these pills three times a day and drink more water.
A: 4.________
B: Yes, much better.
A: 5.________
B: I will. Thank you.