从上下文连贯的要求看,依次填入下面句子的横线上的语句最恰当的一项是( )
生活中种种苦涩,( ),历程中多少挫折,( ),漫漫岁月里的辛苦挣扎,( ),但由于忍耐,由于奋斗,也由于不断地向上望,坚韧的生命终能超越所有的忧患与磨难,而从生活本身获得智慧。
A:曾催人衰老憔悴 曾使人失望流泪 曾给人痛苦沉思
B:曾催人衰老憔悴 曾给人痛苦沉思 曾使人失望流泪
C:曾使人失望流泪 曾给人痛苦沉思 曾催人衰老憔悴
D:曾使人失望流泪 曾催人衰老憔悴 曾给人痛苦沉思
若x=1是方程x2+bx=3的一个根,则b=____ .
下列几种生物中,具有细胞结构的是( )
My name is John Brown. I am a school boy. My school is 1my home. Every day it takes me a lot of time 2 there. The road is not good, so I can't 3my bike to school. I often take a bus there. It usually 4 me forty minutes to get there 5.I 6 at seven every morning. I have no time for breakfast at home. I often have something for breakfast on the bus 7 at school. I don't want to 8school. Some students in our school take buses to school. Some students walk to school 9 their homes are not far.10students ride bikes