Scientists think there has been life on Earth for ______ years.中间填millions of 还是2 million

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• Scientists think that there has been _____（life） on the earth for hundreds of millions of years.为什么课本用单数?
• Scientists think there has been life on Earth for ______ years.中间填millions of 还是2 million
• Scientists think that there has been _____（life） on the earth for hundreds of millions of years.
• Scientists think there has been life on Earth for ______ years.中间填millions of 还是2 million
• Scientists think that there has been _____（life） on the earth for hundreds of millions of years.
• Many people ,e_____________ young people like American movies