Questions 19 to 22 are based on the conversation you have just heard.
A. Because she will go to the concert with Margaret.
Because she will go to the theatre.
C. Because she will have to finish her paper in her flat.
D. Because she is not interested in classical music.
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通过测定______和CO2产生量来计算能量代谢需了解被氧化食物的种类及数量。
______细胞是位于人球小动脉、出球小动脉和致密斑之间的一群细胞,具有吞噬和收缩功能。
______是指机体以热射线的形式将热量传给外界较冷物体的一种散热方式。