Do you know that your skin(皮肤) is the largest organ(器官...
根据Do you know that your skin is the largest organ in your body?(你知道你的皮肤是你全身最大的器官吗?)可知,皮肤是全身最大的器官,因此本句应为肯定回答,可以用it代指主语skin。故答案为:Yes,it is.(2)细节理解题。根据Using a sunscreen with an SPF 15 and reuse it at l...