对某一征税对象开始征税的最低点是( )。
A．免征额B．起征点C．纳税环节D．征税对象
参考答案：B
如图所示，在倒置的漏斗里放一个乒乓球，手指按住球，再从漏斗口向下用力吹气，当手移开时，乒乓球没有下落．该现象说明球上方气体流速______、气体压强______．（选填“增大”或“减小”）
The feeling of competition among the students in all the classrooms where the test was going on was noticeable to everyone. ()
A. discord
B. discovery
C. rivalry
D. cooperation
