用这些a an are is these this it's what回答下面问题

用这些a an are is these this it's what回答下面问题 a an are is these this it\'s what 怎么用? what's this...可以用This is...还是必须用It’s 来回答?还有What are these/th What is this怎么回答,是It is+a/an Is this/that a/an?.. Yes,it is./no,it isn't.2Are these/those What are these?( ) carrots A.it's B.these a 选择 What's this - ( )"A" A.It's B.It's an C.It's a D.This is What is this?It is S.为什么回答不是 It is a S. What`s this?回答是This is a chair.还是It`s a pencil. what's this?回答是既可用It's a...还可用This is a... This is a book,It's an English book.What's this?急. (1)This is a pen.(2)Are these oranges?（3）What's that in Engl