每个收费站应准备适量的预编码卡，一般准备（）的用量。根据实际情况可即时制作。
A.1天
B.一个班次
C.半个班次
参考答案：C
– What is Kitty doing the day after tomorrow?
–_________.
A．She went to the movie
B．She is studying for a math test
C．She has s sore throat
D．She gets to school by train
根据你掌握的物理知识和物理现象，想象一下“假如水的密度变为10 g／cm3”将出现什么现象?请列举三例。
