Answer the questions below. Choose NO MORE THAN THREE WORDS AND/OR A NUMBER from the passage for each answer. Write your answers

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问题 Answer the questions below.
Choose NO MORE THAN THREE WORDS AND/OR A NUMBER from the passage for each answer.
Write your answers in boxes 18-20 on your answer sheet.
What kind of signals from other intelligent civilisations are SETI scientists searching for?

选项

答案radio (waves/signals)

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