1A 4


1.1 Listen to four people talk about the questions in 3. Are the statements true or false? Correct any false statements.


a We dream to help us remember everything that happened during the day. b Hubble’s observations suggest that the universe is over ten billion years old. c The speaker doesn’t think aliens exist. d The speaker thinks we have free will.


5 Match the words (a–i) from 4 with the definitions. a estimate


b evidence


c experiment d explain


e instrument f measure


g observation h research i


theory


to calculate an approximate number or amount to investigate and study a subject


a system of ideas that provides an explanation for something facts or information that show something is true a scientific method of discovering or testing something the process of noticing or watching something happen to give a reason why something happens or exists to find the size, weight or quantity of something a tool that we use to test or measure something


6 Complete the list of verbs and nouns using words from 5. Verb


Noun


a b


c observe d research e f


theorize English for the 21st Century • Unit 1 15


explanation estimation


measurement


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