How does he know these things?__surfing the internet.横线上填什么?

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Howdoesheknowthesethings?__surfingtheinternet.横线上填什么?Howdoesheknowthesethings?__surfingtheinternet.横

How does he know these things?__surfing the internet.横线上填什么?
How does he know these things?__surfing the internet.
横线上填什么?

How does he know these things?__surfing the internet.横线上填什么?
By.
“通过”的意思.