听下面一段材料，回答第 1-4题。 1. What is the most important part of dog-
| 听下面一段材料，回答第 |
| 1. What is the most important part of dog-care? |
| A. Proper feeding. B. Active exercise. C. Clean. |
| 2. How long should food be left before a dog? |
| A. Not more than twenty minutes. B. Not more than thirty minutes. C. Not more than an hour. |
| |
| A. To build its strength B. To help it sleep well. C. To keep it lively. |
| 4. What kind of dog needs to run in an open field? |
| A. An old one. B. A small one. C. A big one. |
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