【多选题】领队带领旅游团在境外海关退税处办理退税手续时,应告知旅游者出示( )。
【单选题】在抗原递呈过程中,抗原肽与MHCⅡ类分子结合的部位是()
【简答题】Most of us drink soda. Even if we know soft drinks are bad for the health. I think we need to know more about this drink that we love so much. And here are five reasons why we drink soda: The taste co...
【单选题】Fast food makes us__________.
【单选题】According to the passage, a kind of food that makes us feel good is called ________.