这 是 什么 ？    这 是 苹果 。    那 是 什么 ？    那 是 西瓜 。    哪个 是 芒果 ？    那个 是 芒果 。     What's this?
This is an apple.
What's that?
That is a watermelon.
Which one is the mango?
That is the Mango.

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What is this? This is an apple. What is that? That is a watermelon. Which is a mango? That is a mango. Lesson Content: What is this? This is an apple. What is that? That is a watermelon. Which is a mango? That is a mango.

• summary [´sʌməri]   a.&n.摘要(的)   (英语四级单词)