听力原文： The bodies of dozens of African emigrants discovered off the Italian coast last week might have been thrown overboard, Italian officials said on Monday. A coast guard spokesman said 15 illegal emigrants, all believed to come from Somalia, survived being thrown into the Mediterranean sea. But one of the survivors, a woman, was in a serious condition. They told the coast guard that their boat had left Libya 20 days before with around 100 immigrants aboard. They said most had died during the trip. Last Friday, 7 Africans, including 3 children, died before their boat could reach the island. A further 25 people survived. How many of the emigrants died after being thrown into the sea?