Tom and Jenny are in the same school. And _________ like sports very much.
A:they
B:them
C:their
D:theirs
下表乃根据赵翼《二十二史札记》整理而成。此表反映的现象是
如图是自制气压计,小红拿着它从1楼乘坐电梯到20楼,玻璃管内水柱的高度会____(选填“升高”、“降低”或“不变”),瓶内的水对瓶子底部的压强____(选填“变大”、“变小”或“不变”)。