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鲸为适应水中生活，减少阻力，它们的后肢消失，前肢变成划水的浆板。身体成为流线型，酷似鱼。因而它们的潜水能力很强，小型齿鲸可潜至100-300米的水深处，停留4-5分钟，长须鲸可在水下300-500米处待上1小时，最大的齿鲸--抹香鲸能潜至千米以下，并在水中持续2小时之久。
3a
Read the following words and phrases about whales. Put them in the correct place in the chart.
3a. Read the following words and phrases about whales. Put them in the correct place in the chart.
Humans catch whales for meat, fat and oil
Eat small fish and other sea life
Jump high out of the water
Rules on whale protection
Huge
Water pollution
Live in the sea
Some kinds have teeth
Learn more about whales
Stop putting rubbish into the sea
Sing songs
Whale parts sold to make things like
candles and soap
How can we protect
them?
Why do some of them have to be protected?
What can they do?
What do they eat?
Where do they live?
What do they look like?
Huge; Some kinds have teeth
Live in the sea
Eat small fish and other sea life
Jump high out of the water;
Sing songs
Humans catch whales for meat, fat and oil; Water pollution; Whale parts sold to make things like candles and soap