—I went to Hainan and __________ great fun there.
A:spent, had
B:spend, have
C:spent, have
D:spend, had
在食物链中处于第三营养级的生物一定是( )
双曲线x24-y24=1的渐近线方程为( )
在-(-2),-|-2|,(-2)2,-22这4个数中,属于负数的个数是( )