# African clawed frog - 科目：雅思听力真题（Part 4） - 考频：中频 - 最近考试：2025.3.29/2022.11.19/2018.2.24/2017.4.22 - 题目数：10 - 来源页：https://www.yaquan.site/paper/8dbe176e-c4f6-4540-83f3-e9adca2eb0ca（在线机考练习与音频请访问该页面） - 数据更新：2026-10-29 ## 题目原文 00:00:01,300 Part four. 00:00:03,220 You will hear part of a biology lecture about an animal called the African clawed frog. First, you have some time to look at questions thirty-one to forty. 00:00:20,660 Now listen carefully and answer questions thirty-one to forty. 00:01:13,960 Today, I’d like to look at another type of amphibian, the African clawed frog, whose Latin name is Xenopus laevis. Its name is derived from the three short claws on each hind foot, which it uses to tear apart its food. The Latin word Xenopus means strange foot, and laevis means smooth. 00:01:38,440 I’ll start with a general description. The African clawed frog is a species of frog that can be commonly found in the eastern and southern parts of Africa. They have a flattened head and body, but no tongue or external ears. As the Latin name suggests, African clawed frogs have smooth skin, unlike the toad, whose skin always has a rough texture. The body of African clawed frogs is covered with mucus, which can give their sensitive skin protection, thus playing an indispensable role in their survival. Male and female African clawed frogs can be easily distinguished through several characteristics, and the major one is their size. Generally, male frogs are about half as big as females. Specifically, female frogs are usually four point five inches long, weighing around seven ounces, while males are generally two point five inches long and two ounces heavy. Then, let’s turn to their habitats. African clawed frogs are entirely aquatic frogs, so they live in water all their life, whether they are tadpoles or adult frogs. Although they can live in a wide range of fresh water environments, they particularly like still water instead of fast-flowing streams. During the summer, African clawed frogs are mainly found in warm rivers, and during the rainy season, they tend to move into flooded forests. 00:03:20,400 In the wild, African clawed frogs are highly adaptable to changes in the environment around them, whether in oases or glacier-covered lakes. Besides, they can even survive in water with high salt levels. It is because African clawed frogs have a unique physiological mechanism in their body that could automatically regulate the balance of water inside and outside their body. In dry weather, African clawed frogs always burrow themselves into mud, where they can survive for more than a year. They are incredibly hardy and long-lived, with an average lifespan of five to fifteen years. Some are even recorded to have lived for twenty to twenty-five years. However, African clawed frogs are susceptible to the pollution of the water, even though they are not listed as endangered species. 00:04:23,620 Now let’s talk about the diet of African clawed frogs. They are carnivores that like hunting insects, spiders, worms, fish, etc. 00:04:33,900 African clawed frogs depend on the sense of smell to detect their prey. They first use the claws on their hind feet to tear pieces of ample food. Then the front feet, which are not webbed, play an important role in feeding. African clawed frogs use their front feet to push food into their mouths, and meanwhile, a distinctive pump system is used to draw or suck food in their mouths. 00:05:03,900 So we can see African clawed frogs are voracious predators and can quickly adapt to many habitats. Therefore, in some parts of the world, African clawed frogs act like invasive species, which will negatively affect other species in the fresh water ecosystems. The evidence shows that they have devastated the populations of native frogs and other creatures by eating their young. As a result, African clawed frogs are illegal to own, transport, or sell without any permit in some states of America, like California, Washington, Arizona, etc., 00:05:47,120 where African clawed frogs have been seen as a type of pest. However, it’s legal to own African clawed frogs in Canada. 00:05:57,220 But not many people know that African clawed frogs are also used in medicine. As we mentioned before, the skin of African clawed frogs is covered with mucus, which has properties of antibiotic. This chemical can help kill bacteria and cure the infection and is widely used by both the medical profession and the general public. So we shouldn’t ignore the medical value of African clawed frogs. 00:06:28,720 That is the end of part four. You now have one minute to check your answers to part four. ## 题目与答案 ### 31. Description: ·They have no tongue or external ears. ·Their skin is 31_____ . Description: ·They have no tongue or external ears. ·Their skin is 31_____ . **答案**：smooth 原文定位：African clawed frogs have smooth skin, unlike the toad, whose skin always has a rough texture 同义替换：「rough texture」↔「smooth」 ### 32. ·The mucus on their skin is for 32_____ . ·The mucus on their skin is for 32_____ . **答案**：protection 原文定位：The body of African clawed frogs is covered with mucus, which can give their sensitive skin protection ### 33. ·Male frogs are 33_____ the size of female frogs. ·Male frogs are 33_____ the size of female frogs. **答案**：half 原文定位：Generally, male frogs are about half as big as females 同义替换：「half as big as」↔「half the size of」 ### 34. Habitats: ·They prefer 34_____ water. Habitats: ·They prefer 34_____ water. **答案**：still 原文定位：they particularly like still water instead of fast-flowing streams ### 35. ·They live in oases or glacier-covered lakes. ·They live in a condition with a high level of 35_____ . ·They live in oases or glacier-covered lakes. ·They live in a condition with a high level of 35_____ . **答案**：salt 原文定位：African clawed frogs are highly adaptable to changes in the environment around them, whether in oases or glacier-covered lakes. Besides, they can even survive in water with high salt levels 同义替换：「condition」↔「environment」 ### 36. ·In the condition of drought, they can survive in 36_____ for a long period of time. ·In the condition of drought, they can survive in 36_____ for a long period of time. **答案**：mud 原文定位：In dry weather, African clawed frogs always burrow themselves into mud, where they can survive for more than a year 同义替换：「drought」↔「dry weather」；「survive in」↔「burrow into」；「a long period of time」↔「more than a year」 ### 37. Diet: ·They use the sense of 37_____ to capture food. Diet: ·They use the sense of 37_____ to capture food. **答案**：smell 原文定位：African clawed frogs depend on the sense of smell to detect their prey 同义替换：「capture food」↔「detect their prey」；「depend on」↔「use」 ### 38. ·They use their claws to tear apart ample food. ·They use their front feet and a unique 38_____ system when feeding. ·They use their claws to tear apart ample food. ·They use their front feet and a unique 38_____ system when feeding. **答案**：pump 原文定位：a distinctive pump system is used to draw or suck food in their mouths 同义替换：「unique」↔「distinctive」；「feeding」↔「eating」 ### 39. Other information: ·People in some states of the USA regard them as 39_____ . Other information: ·People in some states of the USA regard them as 39_____ . **答案**：pest 原文定位：where African clawed frogs have been seen as a type of pest 同义替换：「regard」↔「see」；「invasive species」↔「pest」 ### 40. ·The mucus on their skin has 40_____ properties. ·The mucus on their skin has 40_____ properties. **答案**：antibiotic 原文定位：the skin of African clawed frogs is covered with mucus, which has properties of antibiotic --- 以上内容由鸭圈雅思真题库（www.yaquan.site）提供，收录近期雅思考试真题回忆，支持在线机考模式免费练习。