【正文】
t we go to see a doctor at once when we have the flu? Four. Yes, we must. A: Must we ... to prevent the flu? B: Yes, we must. No, we don’t have to. / No, we needn39。 2. 背 1a以及 P(43)(44)的單詞。t C. needn39。t. keep away from crowded places exercise often take some medicine keep the air fresh all the time 1 2 3 4 Choose one of the pictures to make a dialog. 1. exercise often 2. keep the air fresh 3. go to bed early 4. wash hands and change clothes often 5. keep our rooms clean 6. drink enough water 7. take some medicine 8. keep away from crowded places □ □ □ □