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想一想，填一填。1.“到”共__笔，第2笔是。2.“虹”共_笔，_结构，组词、_。

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Listen to the following passage and fill in the blanks with the words you hear.[音频]When you think about dolphins, you might picture them swimming playfully near boats or doing _1 at a water park. Dolphins spend their whole lives in the water. These_2_ animals look like big fish, so it may surprise you to learn that they are mammals (哺乳动物). As all mammals do, dolphins _3_ air. Dolphins must come to the water’s _4_to breathe. A dolphin breathes through an_5_, called a blowhole, on the top of its head.Dolphins are considered _6_ animals. In captivity, dolphins have shown that they can learn tricks and_7_. Scientists also discovered that dolphins have good _8___ skills.

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