Level 1 · Reading series
Lesson 26 · Red Cabbage, New Colors
Audio track 26
Listen first
Listen once before opening the English passage.
Open the English passage and hover for word help
Cut red cabbage with an adult and put it in hot water. The water becomes purple. Let the cabbage juice cool.
Pour a little into three cups. Add lemon juice to one cup. The liquid may turn pink because lemon juice is an acid. Add baking-soda water to another. It may turn green because it is a base. The purple juice is an indicator. It helps us test different liquids.
Sentence practice
Play any sentence in Dicvo’s Jenny English voice. Before playing all, choose how many times each sentence plays. A practice pause about as long as the sentence follows each play, including before the next sentence. The complete reading remains above.
Choose a sentence to begin.
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Cut red cabbage with an adult and put it in hot water.
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The water becomes purple.
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Let the cabbage juice cool.
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Pour a little into three cups.
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Add lemon juice to one cup.
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The liquid may turn pink because lemon juice is an acid.
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Add baking-soda water to another.
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It may turn green because it is a base.
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The purple juice is an indicator.
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It helps us test different liquids.
Check your understanding
After reading, state the main idea in one sentence and find a line that supports it.
Chinese translation
请在大人陪同下切好紫甘蓝，放进热水里。水会变成紫色。先等甘蓝汁冷却。
把甘蓝汁分别倒入三个杯子，各倒一点。在其中一杯加入柠檬汁。柠檬汁是酸性的，液体可能变成粉红色。往另一杯加入小苏打水；它是碱性的，液体可能变绿。紫色甘蓝汁是一种指示剂，可以帮助我们测试不同液体。
Key words and expressions
Key terms have Chinese explanations. Hover over dotted words in the English passage for word help and pronunciation when available.
- red cabbage
- 紫甘蓝；英语名称中用 red。
- juice
- 汁液；果汁。本文指甘蓝汁。
- liquid
- 液体。
- turn pink
- 变成粉红色；turn 后可接颜色词。
- acid
- 酸；酸性物质。
- base
- 碱；化学中的‘碱性物质’。
- turn green
- 变成绿色。
- indicator
- 指示剂；也可指指标。
- test
- 测试；检验。
- baking-soda water
- 小苏打水。
Background notes (Chinese)
紫甘蓝含有花青素，其颜色会随着液体的酸碱性变化。即使在家观察，也应只使用可食用的材料，不要饮用实验液，并在大人陪同下操作。不要随意拿清洁剂等物品来测试。
资料来源：American Chemical Society 关于紫甘蓝指示剂的课堂活动。