单项选择题 箭头指结构为 A. 胸骨柄 B. 肋弓 C. 胸骨体 D. 剑突

单项选择题 希望一品红花期提前可采用的方法是（  ） A、多施氮肥 B、进行短日照处理 C、进行长日照处理 D、多浇水

多项选择题 The functions of communication can be summarized as ________.A.communication allows you to gather information about other peopleB.communication helps fulfill interpersonal needsC.communication establishes personal identities D.communication exchanges information rather than understanding emotions and intentions behind the information.