问题补充:
With the successful launch of Tiangong-I, which was breakthrough in space field, Chinas space dream took a step closer to reality.
A. a; / B. the; a C. a; the D the; /
答案:
解析:句意:随着航空领域的一大突破天宫一号的成功发射,中国的太空梦朝现实更迈进了一步。第一空填a,泛指这是一个突破,第二空不填,reality是抽象名词,选A。