应该用“they are...”回答，在选择题例优先选择they are。 these做代词意思是“这些”，空间上距说话者较近。提问者用了these说明“这些”距提问者近，但我们往往不知道回答者与“这些”的距离，所以用没有空间含义的they。如下题。 — What are these? — （C） A. This is a book. B. That's a book. C. They're books. D. These are books. 同理，提问是What are those？也应该用they are...来回答。