事实：怀孕测试使用青蛙-Frogs Were Used In Pregnancy Tests（在线收听）

Pre-Listening Vocabulary

• in demand: wanted by many people
• import: to bring in from another country
• lab: short for laboratory; a place where scientific experiments and tests are run
• hormone: a substance that regulates or activates something in the body
• fungus: fast growing organisms that feed on organic matter

Frogs Were Used In Pregnancy Tests Between 1930-1950, African clawed frogs were in great demand. These frogs were imported all over the world and used in labs for pregnancy tests. Technicians injected a sample of a woman’s urine into a female frog’s hind leg. If the frog began producing eggs, the woman’s pregnancy hormone was present. The same frogs were used over and over. When hospitals no longer had any use for the frogs, they were released. This resulted in an environmental disaster. African clawed frogs can carry a dangerous fungus. Hundreds of amphibian species have declined because of this fungus.