英语周报2018-2022七年级20期答案

第二节One possible versionWhen Norah heard of her mothers plan, she was terhappy. She couldnt wait to see Dan at once. Hardly hadthey met Dan in his yard when Norah shouted excitedlyShe ran right up to him as if she had known him all of herlife and she was climbing all over him like a monkeyAnd of course every time I turned around. she d comeback over and hug me again, " Dan said. When it was timeto leave, Norah and her mom passed the rose bush by thedoor. Dan picked a big red rose and gave it to Norah, saying, "This is a symbol of our friendship.The mother and her daughter hane been visiting himceely, erer since. Every time they went there, the old andthe young would play games and tell each other secretsorah considers Dan as a family member and Dan has neverbeen alone again. "Norah helped me recover from my sad-ness and gave me something to live for, Dan said, with afresh shave and haircut

12.(原题)D【解析】亲本白眼雄果蝇与纯合红眼雌果蝇杂交,F1都是红眼果蝇,这爲于实验現象,A错误;F1雌雄果蝇相互交配,Fε出现白眼果蝇,且白眼果蝇都是雄性,这也爲于实验现象,B错误;F中的红眼雌奚蝇与F2中的白眼雄果蝇交配,子代雌雄釆蝇中,红眼和白眼各占一半,由于雌雄个体表现型比例相同,所以不能证明假设内容,C错误;野生型红眼雄果蝇与白眼雌采蝇交配,子代只有红眼雌果蝇和白眼雄果蝇,子代雌雄个体表現型比例不同,可以说明白眼基因只存在于Ⅹ染色体上,Y染色体上不含有它的等位基因D正确。

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