3. Read and listen to the article. Complete the article with numbers and measurements from exercise 2.

(Đọc và nghe bài viết. Hoàn thành bài viết với các số và phép đo từ bài tập 2)

There are many amazing stories of human survival, but actually our bodies are very fragile and do not cope well with extremes. Polar explorers can cope with temperatures of (1) ____________, but only if they keep warm. Most people will collapse if their body temperature drops by only (2) ____________ and if it drops by (3) ____________, they'll die. Heat can be just as dangerous. Temperatures of 35°C are safe, provided humidity is not above (4) ____________. High altitudes are dangerous too. We pass out when the pressure falls below (5) ____________ of normal atmospheric pressure. This happens at about (6) ____________ metres. Climbers can go higher because their bodies gradually get used to it, but no one survives for long at 8,000 metres. At high altitudes, lack of oxygen is another problem. At ground level, about (7) ____________ of the air is oxygen. If that falls below (8) ____________, we die.

5. Read the sentences aloud, paying attention to the numbers. Then listen again and decide whether the sentences are true or false. Write T or F and correct the false sentences.

(Đọc to các câu, chú ý đến các con số. Sau đó nghe lại và quyết định xem câu đó đúng hay sai. Viết T hoặc F và sửa những câu sai)

1. When a Russian space capsule had a major problem in 1971, the cosmonauts died in less than 30 seconds.

2. In 1966, a scientist passed out after 15 seconds ina vacuum.

3. The scientist passed out for 27 seconds.

4. In the 1960s, Randy Gardner stayed awake for more than 250 hours.

5. After staying awake for so long, Randy Gardner then slept for almost 50 hours.