2020—2022年英语周报八年级新目标第4期答案

5.B【解析】红绿色盲症是伴X染色体隐性遗传病,若该单基因遗传病为红绿色盲症(设相关基因为B、b),则1号的基因型为XbY,2号的基因型为XBX-,1号和2号可以生出不患病的3号、4号,A正确;抗维生素D佝偻病为伴X染色体显性遗传病,父亲患病,女儿一定患病,B错误;白化病为常染色体隐性遗传病,该单基因遗传病可能为白化病,C正确;若该病为常染色体隐性遗传病,则2号、3号和4号的基因型可能相同,例如均为杂合子,D正确。

Paragraph 1The boys had watched, open-mouthed, tohen their sisterplaced her favorite doll in the box. Without a word, theboys rose and went to their rooms and came back carryingtheir favorite toys to the living room. Astonished, I realizedthat the boys had also recognized what little Meghan'saction meant. I thought all of them wanted to make thesepoor people who had nothing happy like them. Swallowingback tears, I pulled all three of them into my armsParagraph 2I looked at my children for a long moment. I removemy old jacket from the box of clothes, too. I replaced itwith the new hunter green jacket that I had found on salelast week. I hoped the young woman in the picture wouldlove it as much as I did. What Meghan didson that the true spirit of dethheart

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