45.【2019 • 山西省中考】 —Some schools have used smart uniforms. I wonder ___________.
—They can tell parents where their children are.
A. who invented them B. what they are used for C. when students wear them
【答案】B
【解析】句意：——有的学校已经运用了智能的校服。我想知道它们被用来做什么。——他们能告诉父母他们的孩子在哪儿。who invented them谁发明了他们；what they are used for他们用来干什么；when students wear them学生们什么时候穿他们。根据下面的答语They can tell parents where their children are可知，题目中问的是智能校服的用途，故应选B。
—They can tell parents where their children are.
A. who invented them B. what they are used for C. when students wear them
【答案】B
【解析】句意：——有的学校已经运用了智能的校服。我想知道它们被用来做什么。——他们能告诉父母他们的孩子在哪儿。who invented them谁发明了他们；what they are used for他们用来干什么；when students wear them学生们什么时候穿他们。根据下面的答语They can tell parents where their children are可知，题目中问的是智能校服的用途，故应选B。
