| 31. | Under what class does this animal fall? |
| 这动物属于什么纲？
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| 32. | The explorers didn't know whether the strange creature was human or animal . |
| 探险者不知道那个奇怪的东西是人还是动物。
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| 33. | This small desert animal dishes out a shelter for itself in the sand. |
| 这种沙漠小动物会在沙里挖出盘状的栖身巢穴。
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| 34. | The animal doubled on its tracks. |
| 那野兽急忙折回逃跑。
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| 35. | The children romped on the lawn, full of animal spirits. |
| 孩子们生气勃勃地在草地上嬉闹玩耍。
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| 36. | He subscribes to an animal protection society. |
| 他给动物保护协会捐款。
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| 37. | Animal manure makes a good fertilizer. |
| 动物粪便是很好的肥料。
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| 38. | It is almost always due to some very special circumstances that traces of land animals survive, as by falling into inaccessible caves, or into an ice crevasse, like the Siberian mammoths, when the whole animal is sometimes preserved, as in a refrigerator. |
| 几乎总是由于某些特殊的条件，陆地动物的遗体才被存下来，如掉进难以到达的洞穴，或掉进冰河裂缝里，或者像西伯利亚长毛象那样掉进冰窟中，有时整个动物像被放在冰箱里一样被保存下来，
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| 39. | The experts were now fully convinced that the animal was a puma, but where had it come from? |
| 专家们如今已经完全肯定那只动物就是美洲狮，但它是从哪儿来的呢？
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| 40. | to think that a dangerous wild animal is still at large in the quiet countryside. |
| 想到在宁静的乡村里有一头危险的野兽继续逍遥流窜，
|