| 听下面一段材料，回答第1至4题。 |
| 1 .When are people easy to catch a cold? |
| A. In spring or winter. B. In spring or autumn. C. In autumn or winter. |
| 2. Why haven't scientists found a cure for the common cold according to the passage? |
| A. There are too many kinds of cold viruses for them to identity. B. It is not economical to find a cure for each type of cold. C. They believe people can recover without treatment. |
| 3. What does the speaker say about the symptoms of the common cold? |
| A. They reveal the seriousness of the problem. B. They indicate how fast the virus spreads. C. They show our body is fighting the virus. |
| 4. What do some scientists say about taking medicines for the common cold? |
| A. It helps us to recover much sooner. B. It actually does more harm than good. C. It causes damage to some organs of our body. |