—I ______ twenty yuan on it. It was 50% off.
A:take, spend
B:take, cost
C:cost, spent
中国人吃饭用筷子,韩国人用筷子吃菜、勺子吃饭;中国喜事都用红信封,而韩国人用白信封送礼;中国人送礼要厚礼,韩国人一双袜子也算是送礼……这反映了( )
对方程x2-2x-13=1去分母正确的是( )