accumulate 累积（数量逐渐增加）

mutations 突变、变异

larynx 喉

triggering 引发

mechanisms 原理、机制

archaeological 考古学的

harbouring 使藏着，使潜伏着

测验 请听报道并回答下列问题。

1. How many mutations are seen on average in each lung cell every year for a 20 a day smoker?

2. Which part of the body is more likely to experience DNA mutation for a smoker?

3. True or false? ‘Tissues not directly exposed to smoke are protected from DNA mutations.’

4. Which word has a similar meaning to ‘historical’?

答案 1. How many mutations are seen on average in each lung cell every year for a 20 a day smoker?

On average 150 mutations can happen to each lung cell.

2. Which part of the body is more likely to experience DNA mutation for a smoker?

The larynx or the voice box is most likely to experience DNA mutations for a smoker.

3. True or false? Tissues not directly exposed to smoke are protected from DNA mutations.

False. Even tissues that are not directly exposed to smoke are at risk from DNA mutations.

4. Which word has a similar meaning to ‘historical’?

Archaeological.

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