填空题 {{B}}Part A{{/B}} {{I}} You will hear a passage. Listen and complete the sentences in questions 1-5 with the information you have heard. Write not more than three words for each answer. You will hear the recording twice. You now have 25 seconds to read the questions below.{{/I}}

填空题 What is the main topic of this talk?

填空题 What have scientists discovered in the past 20 years?

填空题 Which is more important in a dream?

填空题 What affects a person’s perform through the day?

填空题 What do scientists hope to do some day?