Lan的ScalersTalk第四轮新概念朗读持续力训练Day

练习材料：

[Day 1750 2019-07-12]

Lesson 20-1 Snake poison

How it came about that snakes manufactured poison is a mystery. Over the periods

their saliva, a mild, digestive juice like our own, was converted into a poison that defies

analysis even today. It was not forced upon them by the survival competition; they

could have caught and lived on prey without using poison, just as the thousands of nonpoisonous snakes still do. Poison to a snake is merely a luxury; it enables it to get its

food with very little effort, no more effort than one bite. And why only snakes? Cats,

for instance, would be greatly helped; no running fights with large, fierce rats or tussles

with grown rabbits -- just a bite and no more effort needed.

任务配置：L0+L1+L4

知识笔记：

saliva    n. 唾液;

defies    v. 违抗; 反抗; 蔑视; 不可能，无法(相信、解释、描绘等); 经受住; 顶住; 抗住;

analysis      n. (对事物的) 分析，分析结果; (对物质的) 分析;

prey    n. 猎物; 受害者; 受骗者;    v. 捕食; 掠夺; 折磨;

nonpoisonous    网络 无毒的; 无毒; 无毒性的;

tussles    n. 扭打，争斗，争执(尤指为了争得物品);    v. 扭打，争斗(尤指为了争夺物品);

grown    adj. 成熟的; 成年的; 长大的;    v. 扩大; 增加; 增强; 长大; 长高; 发育; 成长; (使) 生长;

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