In this section，you will hear several passages. Listen to the passages carefully and then answer the questions that follow.
Questions 1 to 3 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now，listen to the passage.
1. According to the passage, a survey about butterflies is carried on by______.
A. British Isles
B. British Butterfly Conservation
C. Environment Conservation in the UK
D. Sir David Attenborough
2. How many percent of butterfly species are suffering the population declination?
A. More than 59%.
B. More than 50%.
C. More than 45%.
D. More than 75%.
3. Which of the following is NOT mentioned in the passage?
A. Butterflies in profusion tell us that all is well with nature.
B. Butterfly species' declining indicates that other wild lives will face extinction.
C. The butterflies，situation tells us the relationship between nature and human being.
D. The butterflies survey makes public aware of the importance of butterflies.
