📝 字母掌握小测
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1. Which letter does this lesson focus on?
本课是第 24 课，核心字母是 Xx。
2. Which word starts with letter Xx?
本课的首个核心单词是 X-ray（X光）。
3. Complete the sentence: "Xx is for ______"
绘本第二句是：Xx is for six（数字六）。
4. Which of these words is NOT in this lesson?
本课的三个字母词是 X-ray、six 和 box。
5. What is the third word learned with Xx?
第三个核心词是 box（盒子）。
