| 1. No. (No, they aren't.) 2. When coming into touch again with the outside world. 3. Five. 4. Because people like to stay indoors, and this makes it easier for cold viruses to be passed on. 5. Colds are not caused by cold weather. (Colds are caused by viruses, not by cold weather.) (答案不唯一) |
内容全部来源于网络收集，如有侵权，请联系网站删除：QQ：24596024