–Look! So many colorful bicycles in two lines over there. --They’re for the public. This ______of green smart traffic is everywhere in Xi’an.(本题2.5分) A、 number B、 pair C、 kind D、 piece

–Look! So many colorful bicycles in two lines over there.
--They’re for the public. This ______of green smart traffic is everywhere in Xi’an.(本题2.5分)
A、 number
B、 pair
C、 kind
D、 piece

出自：西安石油大学大学英语

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