📝 字母掌握小测
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1. Which letter does this lesson focus on?
本课是第 19 课，核心字母是 Ss。
2. Which word starts with letter Ss?
本课的首个核心单词是 sun（太阳）。
3. Complete the sentence: "Ss is for ______"
绘本第二句是：Ss is for sock（袜子）。
4. Which of these words is NOT in this lesson?
本课的三个字母词是 sun、sock 和 sandwich。
5. What is the third word learned with Ss?
第三个核心词是 sandwich（三明治）。
