marine mammals 海洋哺乳动物

sponges （天然）海绵

scouting 寻找，搜索

invention 自发的新行为、新活动

natural ability 天生的能力，本能

测验 请听报道并回答下列问题。

1. What are sea otters often seen doing, according to the text?

2. What have dolphins in Australia been seen to use tools for? 

3. True or false? In sea otters, using tools seems to be a relatively recent activity.

4. Which word in the text means ‘the information that shows if something is true or not'?

答案 1. What are sea otters often seen doing, according to the text?

Sea otters are often seen floating on their backs hammering at clams with rocks, according to the text.

2. What have dolphins in Australia been seen to use tools for? 

They have been seen to use sponges to protect their noses when scouting for fish on the sea floor.

3. True or false? In sea otters, using tools seems to be a relatively recent activity.

False. New research suggests, even the ancestors of sea otters living millions of years ago knew how to use tools.

4. Which word in the text means ‘the information that shows if something is true or not'?

Evidence.

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