对划线词提问They are passports中对passports提问,将句子改成what are they?和what are these?有什么区别,还是what are these?对划线部分提问是错误的,如果说是错误的,那为什么?求大神解答

They are (books)对划线部分提问 They are bananas.(对划线部分提问) They are eleven对eleven划线提问 They are in Grade One.对Grade One划线提问 They are workers.(对划线部分workers提问) They are Jim's friends 对划线部分提问 They are playing chess对划线部分提问 They are from Japan.(对划线部分提问） /They/are from American.对划线部分提问 they are(typing the letters)就对划线部分提问 They are _talking_ now.对划线部分提问.___are they___now? They are under the desk.(对划线部分提问) they are going to ____celebrate__after school.对划线部分提问 they are 【in the woods】 对划线部分提问 They are toy cars.(对划线部分提问） ---------- They are on vacation in Chengdu对划线部分提问 They are fat chicks.对chicks 划线提问, they are reading story books（对划线部分提问）（they是划线部分）