单项选择题 The Grand Theatre is located on one corner of ________ is called the PeoplesSquare.A. which B. what C.the place D. that

单项选择题 某封闭系统经历一个可逆过程，系统所做的功和排出的热量分别为100kJ和45kJ，则系统的熵变为（）。

单项选择题 —Did you have any trouble with the customs officer?—________ to speak of.A. No B. Nothing C.None D. Neither