武夷新区以（）为主体构建贯穿武夷新区各功能片区的生态廊道，保证城市内部生态联系畅通。
A.双世遗
B.城市快速通道
C.崇阳溪
参考答案：C
— Is that girl in red Sally?
—No, it _________ her. She has gone to Hong Kong.
A. may be B. must be C. can't be
简述氮气的理化性质。
