产品详情

　　下面小编跟大家一起了解大学英语四级新闻听力练习分享，希望对大家的学习有所帮助。
　　一、听力练习
　　1.
　　A. Birth rate in United States drops to lowest level in 10 years.
　　B. Twin births drop to lowest level in 10 years.
　　C. Infant mortality rate drop to lowest level in 10 years.
　　D. Maternal mortality rate drop to lowest level in 10 years.
　　2.
　　A. 15 percent.
　　B. 20 percent.
　　C. 50 percent.
　　D. 31 percent.
　　二、听力文本
　　United States health officials say the number of twin births nationwide has dropped to their lowest level in 10 years. Twin births nationwide began to increase about 40 years ago, CDC records show. From 1980 until 2014, the total number rose 79 percent. But from 2014 to 2018, the twin birth rates fell 4 percent. Last year, there were 32.6 twins for every 1,000 total births, the CDC reported. In 2018, about 124,000 babies born in the United States were twins. That represents about one in every 31 births. Health experts say there is no single explanation for the falling twin birth rates. However,
　　三、重点词汇
　　1. in vitro fertilization: a treatment for a woman who cannot become pregnant naturally, in which an egg is fertilized outside her body and the resulting embryo is put into her womb to develop into a baby 体外受精，试管内受精
　　2. embryo: an animal that is developing either in its mother's womb or in an egg, or a plant that is developing in a seed 胚，胚胎