试题详情
阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。
Replacing (更换) some things in your house at the right time can make you healthier. Some researches show us when and why the following things should be replaced.
| Item | Toothbrush | Cutting board | Chopsticks | Blanket |
| Main material | Plastic | Wood | Wood | Wood |
| Cleaning way | Using warm water | Using hot water | Using hot water | Dry-cleaning |
| Replacing reason | Causing a toothache | Producing bacteria (细菌) | Producing bacteria | Being worn out |
| Replacing time | Every three months | Every three years | Every five months | Every five years |
知识点
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