Old people’s eyes aren’t very good. They need ________ to read. A. glass B. glasses C. a glass D. the glass
用课文原句填空。⑴关关雎鸠， 。（《诗经》）⑵忽如一夜春风来， 。（岑参《白雪歌送武判官归京
I had been a step-mother for six years, and with my husband，I had watched his young children growing into teenagers. Although they lived mostly with their mother, they spent a lot of time with us. O
若实数x、y、m满足|x﹣m|＜|y﹣m|，则称x比y接近m． （1）若x2﹣1比3接近0，求x的取值范围； （2）对任意两个不相等的正数a、b，证明：a2b+ab2比a3+b3接近；
2011年5月26日，人民日报评论员发表评论员指出：执政着要在众声喧哗中倾听“沉没的声音”。上述观点与下列名言的寓意最贴近的是（ ） A．
铅蓄电池的两极分别为Pb、PbO2，电解质溶液为H2SO4，电池放电时时的反应为Pb+PbO2+2H2SO4=2PbSO4+2H2O，下列对电池放电时的分析正确的是 A．Pb为正极被氧化
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