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 from 4 with a definition. a estimate
1 b evidence
c experiment d explanation e instrument f measure
g observation h prove i
research j theory
to calculate an approximate number or amount 2 to investigate and study a subject
3 to use facts and evidence to show something is true 4 a system of ideas that provides an explanation for something 5 facts or information that show something is true 6 a scientific method of discovering or testing something 7 the process of noticing or watching something happen 8 a reason why something happens or exists 9 to find the size, weight or quantity of something 10 a tool that we use to test or measure something
6 Complete the list of verbs and nouns using words from 5. Verb
a
b explain c
d observe e research f
g theorize English for the 21st Century • Unit 1 13
