下图为某地地质剖面示意图，图中甲～丁四地中，属于背斜构造的是（     ）

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    This is Ken. He likes pandas best. ①Because he thinks pandas are smart. Pandas are from China. His friend Tom is different from(与……不同) him. Tom's favorite animals are giraffes because he thinks they are very cute and friendly.

    I like tigers. I think they are beautiful and energetic（充满活力的）. But now the tigers, especially（特别）the Manchurian tigers(东北虎), are in great danger. We must save them.

    We love animals. ②We think people should protect（保护）all the animals.

句子转换。

①我们的成长需要友谊；

②要善待我们身边的友谊；

③朋友是世界上可信赖的东西；

④同学之间互相交往需要友谊。