Đề thi VSTEP Reading C1 — The Gut-Brain Axis (mẫu r2)

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Why does the author mention that the brain was once thought to be 'sealed behind the blood-brain barrier'?

A. To argue that the blood-brain barrier prevents any future treatments from working B. To emphasise that earlier assumptions about the brain's isolation have been challenged C. To introduce a technical term that will be formally defined later in the passage D. To claim that gut microbes can never cross into the brain under any circumstances

Đề thi VSTEP Reading C1 — The Gut-Brain Axis (mẫu r2)

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