已知关于x的一元二次方程(k﹣1)x2+3x+k2﹣1=0有一根为0,则k=( )
A:1
B:-1
C:±1
D:0
课堂上,教室里各个位置的同学都能看到黑板上的字,这因为光在黑板上发生____ (选填“漫”或“镜面”)反射的缘故;部分近视同学为看到黑板上的字,他们戴的是近视眼镜,该近视眼镜是____ (选填“凸”或“凹”)透镜.
从方框中选择适当的词, 并用其适当形式填空。
interesting, five, begin, race, more
My favorite festival of the year is the Dragon Boat Festival. It is on lunar May ____. I can eat ____ zongzi on this day. And I can also watch dragon boat ____ near my home. It's very ____. The festival means the ____ of hot summer. We usually have a big dinner in the evening.