英语周报2022九年级达州第59期答案

写作Paragraph 1: Jatin looked up and saw the other boys rushing ahead Refusing togive up at this point, he jumped to his feet and ran as fast as he could. Hedashed across the finishing line and won the fourth prize. Thinking he would lether sister down, Jatin couldn t help sobbing. Just then he suddenly heard theannouncement from the broadcast that he won the thirdprize as the runner whocollided with Jatin was disqualified for breaking the rule. holding the shoes closeto his chest during the award ceremony Jatin felt overjoyed and relieved as heeventually won the shoes for his sister.(要点1 Jatin获奖)Paragraph 2Filled with pleasure, Jatin walked home quickly.(高分句型一) He could notwait to see his sister and share the good news. On his arrival, Jatin found Zahrawas waiting outside. Nervous and anxious, Zahra wondered whether herbrother had brought her what she was expectingZahra, see what i have gotfor you. Jatin said excitedly taking the prize out of his bag with his tremblinghands. The instant Zahra saw the shoes, her face lit up. So thrilled was shethat she threw herself at Jatin.(高分句型二)" Thank you!ltin." Tears of joywelled up in their eyes as the brother and the sister hugged tightly together (4 R2把奖品给妹妹)

33.(10分,除标注外,每空1分)(1)(规则的)双螺旋复制起点的数量(2分)(2)第一代DNA第二代DNA(4分)(3)DNA复制是双向的(2分)(4)单【解析】(1)DNA复制开始时首先必须解旋,从而在复制起点位置形成复制叉,所以可以根据复制叉的数量推测复制起点的数量。(2)因为DNA复制为半保留复制,故复制一次所得的2个DNA分子中,一条链带放射性标记,另一条链不带。复制两次后所得的4个DNA分子中,有2个DNA分子都是其中一条链带放射性标记,另外2个DNA分子则是两条链都带放射性标记(3)由图示可以看出,该DNA分子复制是双向的。(4)由图4可知,该DNA分子有一个复制起点,即单起点复制。

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