题目

乳酸在多种生物化学过程中起着重要作用，酸牛奶中含有乳酸，其结构简式如图所示。 （1） 乳酸不可能发生的反应是(填序号，下同)。①取代反应；②酯化反应；③水解反应；④消去反应；⑤中和反应 （2） 下列物质与乳酸互为同系物的是，与乳酸互为同分异构体的是。①CH3CH2OH ②HOOC-CH2-CH2OH ③CH2(OH)CH2CH=CHCOOH ④ （3） 两分子乳酸在一定条件下可形成六元环酯，其结构简式为。 Last night was the last game for my eight-year-old son's soccer team. It was the final quarter. The score was two to one, my son's team in the lead. Parents surrounded the playground, offering encouragement. With less than ten seconds remaining, the ball suddenly rolled in front of my son's teammate, Mickey O’ Donnel. With shouts of "Kick it!" echoing（回响）across the playground, Mickey turned around and gave it everything he had. All around me the crowd erupted（爆发）. O'Donnel had scored! Then there was silence. Mickey had scored all right, but in the wrong goal, ending the game in a tie. For a moment there was a total hush. You see, Mickey has Down syndrome (唐氏综合症) and for him there is no such thing as a wrong goal. All goals were celebrated by a joyous hug from Mickey. He had even been known to hug the opposing players when they scored. The silence was finally broken when Mickey, his face filled with joy, hugged my son tightly and shouted, "I scored! I scored. Everybody won! Everybody won!" For a moment I held my breath, not sure how my son would react. I need not have worried. I watched, through tears, as my son threw up his hand in the classic high-five（致礼）salute and started chanting, "Way to go Mickey! Way to go Mickey!" Within moments both teams surrounded Mickey, joining in the chant and congratulating him on his goal. Mike happily and everyone sent their wishes to him. Later that night, when my daughter asked who had won, I smiled as I replied, "It was a tie. Everybody won." 1.Which is the most correct description of the author’s too? He was/had        .     A．brave          B．honest         C．sympathy       D．pride 2.The underlined word “hush” in Paragraph 3 is closest in meaning to “          .”     A．stare          B．silence        C．congratulation D．noise 3.After Mike scored, the author help his breath, because      .     A．Mike cheated everyone            B．everyone would accept the fact     C．the score was out of his expectation               D．his son might get angry with Mike 4.We can infer from the passage that Mike         .     A．was cared about by his teammates     B．was hared by his own team     C．was corbarrassed when he realized the fast     D．was warm-hearted and played soccer for both teams