已知关于x的函数同时满足下列三个条件: ①函数的图象不经过第二象限; ②当时,对应的函数值; ③当时,函数值y随x的增大而增大. 你认为符合要
鸟卵结构中,哪一部分是卵细胞的主要营养部分?( ) A.卵壳 B.卵白 C.胚盘 D.卵黄
The project ______ last month but unfortunately it had to be prolonged(延长) because of the financial problem. A. needn’t have been finished B. shouldn’t have finished C. could have been
“北人避胡多在南,南人至今能晋语。”对唐朝张籍的这句诗理解最准确的是 A.北方人大多害怕胡人 B.南方人与北方人有不同的特点 C.
The shop doesn’t open until 11 am, _______ it loses a lot of business.A. for B. or C. butD. so
依次填入下面横线处的词语,恰当的一项是( ) ①青春意味着勇气多于怯懦,青春意味着冒险多于________。 ②阅读使人充实,交谈使人敏捷,写作使人___
5.A解析:因为函数有0,1,2三个零点,可设函数为f(x)=ax(x-1)(x-2)=ax3-3ax2+2ax 因此b=-3a,又因为当x>2时f(x)>0所以a>0,因此b<0 若由一个2*2列联表中的数
He just does what he pleases and never _____ about anyone else.A. think B. thinks C. thinking D. thought