南方某城郊5月底，突然出现一批急性瘫痪病人，病人呈家庭聚集性，家庭各成员在1个月左右的时间内陆续发病，发病家庭相对散在；大量参与照看患者的邻居无一发病(与患者不共餐)亟需开展的工作为
A．开展深入的流行病学调查，尽快找到病因
B．初步诊断
C．治疗
D．封存可疑食物
E．上报
参考答案：A
解析：探索病因是早期诊断、治疗、预防以及康复等工作的基础。
| 完形填空。 | ||||
| Once a big horse and a small donkey were traveling together, carrying many things on their backs for their owner. The horse was very strong, 1 he carried as heavy as the donkey. The donkey was able to keep up with the big horse in the 2 . But after a while, the donkey began to feel too 3 to keep up any more. So the donkey asked the horse, "Brother Horse, could you please help me? I am afraid I 4 go on carrying as heavy as you do." "No, you carry yours. I carry 5 . It is not my problem that you are not as big and strong as me," answered the horse, feeling very 6 that he was stronger. Not long after that, the donkey finally 7 to the ground and died. Their owner moved what the donkey carried 8 the back of the horse. The horse had to 9 the double load for the rest of the journey. He now knew he should have helped the donkey out. That way 10 the donkey could carry something. The horse was sorry for being too selfish, but it was too late. | ||||
|