A:③⑥①④⑤②
B:③⑤①②⑥④
C:⑤②①⑥④③
D:⑤③①②④⑥
按要求,写单词。
break(过去式)____
______ birds.
—Oh, my God! It's really heavy. I can't imagine how big it is! Is it an adult elephant?
如图,抛物线y=x2+bx+c经过点A(﹣1,0),B(3,0).请解答下列问题:
注:抛物线y=ax2+bx+c(a≠0)的对称轴是x=﹣b2a.