— It's dangerous to swim in this river.
—Yes, you are right. The government has ______ people not to swim in it.
A:trained
B:warned
C:make
D:encouraged
《望岳》中最能体现诗人希望攀登绝顶,俯视一切的雄心壮志的诗句是( )。
一个角的度数为20°,则它的补角的度数为____