问题
选择题
下列关于蛋白质和氨基酸的叙述，正确的是[ ]
A．具有生物催化作用的酶都是由氨基酸组成的
B．高等动物能合成生命活动所需要的20种氨基酸
C．细胞中氨基酸种类和数量相同的蛋白质是一种蛋白质
D．在胚胎发育过程中，基因选择性表达，细胞会产生新的蛋白质
答案
答案：D
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下列关于蛋白质和氨基酸的叙述，正确的是[ ]
A．具有生物催化作用的酶都是由氨基酸组成的
B．高等动物能合成生命活动所需要的20种氨基酸
C．细胞中氨基酸种类和数量相同的蛋白质是一种蛋白质
D．在胚胎发育过程中，基因选择性表达，细胞会产生新的蛋白质
答案：D
My friend Jenny from Germany spent some time traveling in India. She 36 the country so much that she always got attracted to it. While there, she stayed with Leela, her friend who was Indian. 37 the gazes that she got as a foreigner, Jenny always had language problems. It was very difficult for her to 38 in this new environment and culture that had so many subtle (细微的) 39 from her own country. One day, a 40 thing happened. Along with Leela, she went to visit an orphanage. All the children there were tiny; each one fell 41 between the ages of fifteen days to one-and-a-half years old. After some initial(最初的) 42 , Jenny slowly went to the kids and sat beside them. After some time, one of the kids smiled at her. She felt 43 a little, and she was immediately 44 towards that child. She slowly held the child and started singing a rhyme in 45 . The small child continued to smile and started 46 after her. The words that escaped the little mouth were much different from those that Jenny hummed, but the 47 was the same. Wanting to join in the 48 , another kid went up to Jenny and started humming the rhyme. They shared a million 49 together. 50 Leela's eyes on her, she blurted( 脱口而出) an explanation straight from her heart: “See, I don't have 51 problems here. We speak; we communicate!” And she continued with her rhyme 52 she didn’t want to disturb the child’s smile. That day, it was 53 for Leela and the others in the orphanage to see such a heartwarming scene. In that moment, she understood: we're all simply human, and we have the ability to 54 with each other; it's 55 , and comes from deep inside.
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