Trắc nghiệm: The sentence “A valve in each ventricle stops the blood from flowing backwards.” can best fit which of the numbered spaces in the passage? | Gửi trắc nghiệm |
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Trắc nghiệm: The sentence “A valve in each ventricle stops the blood from flowing backwards.” can best fit which of the numbered spaces in the passage? | Gửi trắc nghiệm |