—Yes. It begins with ______ "n".
A:the; a
B:the; an
C:a; the
D:the; the
________my bike was broken, ________ I went to school by bus yesterday.
如图所示,某同学为验证空气中含有少量二氧化碳,将大针筒内的空气一次性压入新制的澄清石灰水,发现石灰水没有变化。据此,你认为该同学应该()