New Words：

slug [slʌɡ] n. 鼻涕虫; 蛞蝓
snail [sneɪl] n. 蜗牛
shell [ʃel] n. 壳; 外壳

Sample Sentences：

Slugs and snails feed at night.
The snail is pushing out its horns.
Most snails have shells on their backs.
My daughter screamed when she saw a slug.
Turtle pulled her head and feet inside her shell.

scream [skriːm]
n.尖叫；尖锐刺耳的声音
v.尖叫；高声喊

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