听力音频：
Question 21-27
Write NO MORE THAN TWO WORDS AND/OR A NUMBER for each answer
Whale Survey
Considerations: • The 21 ______ should be carefully chosen. • State of the sea: 22 ______ or choppy; • And state of 23 ______ • Visibility: 24 ______ • Details in need of attention: the appearance of 25 ______
Need to evaluate or identify: • the 26 ______ and appearance of whales • scales: the 27 ______ and species, the possible age etc.
Questions 28-30
Match the following type of whales with the pictures given according to different feature descriptions.
图片链接：
https://mp.weixin.qq.com/s/QfGpdUe-Wf6HlgkLqtZlJw?token=401316470&lang=zh_CN
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Sperm whale______
29. Northern right whale______
30. Minke whale______
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