第3题: [单项选择]肺循环起始于 A. 左心房 B. 门静脉 C. 冠状动脉窦 D. 下腔静脉 E. 右心室 参考答案:E
第4题: [单项选择]________ phoneticians study speech sounds from the speaker’s point of view.They study the process of how a speaker uses his/her speech organs to produce sounds.( ) A. Articulatory B. Auditory C. Acoustic D. General 参考答案:A