Read aloud
Instruction:
Look at the text below. In 40 seconds, you must read this text aloud as naturally and as clearly as possible. You have 40 seconds to read aloud.
Killer Cosmic Rays
Killer cosmic rays from nearby supernovae could be the culprit behind at least one mass extinction event, researchers said, and finding certain radioactive isotopes in Earth's rock record could confirm this scenario.
A
0/0
AnswersDiscussion
Frequency:
Source:
Order: