21.（ ）

(单选题)What is the author’s attitude toward the hoarding toilet pap (单选题)By describing the scene of our defense against an enemy in P (单选题)Why do shoppers have a panic toilet paper buying? (单选题)What’s the author’s attitude towards different food cultures (单选题)Why do some immigrants have to change the original dishes in (单选题)What does the underlined “it” in Paragraph 2 refers to? (单选题)What’s the function of food mentioned in the article? (单选题)What do golf ball divers and worm pickers have in common? (单选题)What do face feelers do in their daily work? (单选题)What’s the text mainly intended to introduce?