2022-2023全国100所名校英语七 答案

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One possible version:As daylight began to fade,we offered our thanks for thevisit and said goodbye.Holly sat quietly in the car on theway home,pressing her forehead against the window as iflost in thought.All the way we didn't say even a singleword.No sooner had we come to a stop in the drivewaythan she threw open the back door and flew straight to theside gate of our house.I followed her silently and my throattightened as I observed my daughter standing by the rubbishcan,looking inside.Soon she sighed,paused for a secondor two,and walked inside,seeming slightly anxious."Is this what you were looking for?"I asked her in agentle voice as I drew out the carpet from the cupboard andplaced it in front of her.She gazed at me with absolute sur-prise,which soon turned to wild joy."Thanks.Thankyou,Mom!"She nearly screamed out when I threw openmy arms and hugged her tightly just as she did with the car-pet.I could see tears shining in her eyes,a drop or twosplashing onto the dark blue carpet.Magically,what sheonce didn't even want to refer to now tured out to be herprecious birthday present.

11.B【命题意图】本题考查根据比例分析性状的遗传方式等知识，意在考查考生的信息获取能力、分析能力和综合运用能力。【解析】暗红色（甲）、棕色（乙）、朱红色（丙）、白色（丁）四种果蝇均为纯合子，由杂交组合二：乙×0丙→F,暗红色：棕色=1：1可知，雌性亲本棕色乙的基因型为__XX,雄性亲本朱红色丙的基因型为_XY,F,中棕色子代基因型为-_XY,F,中暗红色子代的基因型为__X“X,因为基因型为aaXX的表型为白色，因此亲本棕色乙的基因型为AAXX,即F,中棕色子代的基因型为AXY,暗红色子代的基因型为AXX,暗红色基因型为双显，白色基因型为双隐，因此棕色与朱红色基因型均为单显，又因为亲本朱红色丙含有B基因，因此亲本朱红色丙的基因型为aaXY。综上所述，棕色的基因型为A_XX或AXY,暗红色的基因型为AX"X或A一XY,白色的基因型为aaXX或aaXY,朱红色的基因型为aaXX-或aaXY。杂交组合一中的甲为雌性纯合暗红色，基因型为AAXX,杂交组合二中的丙为雄性纯合朱红色，基因型为aaXY,A分析正确；杂交组合一的F,相互交配，即AaXX×AaXY,F2棕色眼果蝇的基因型为A_XY,仅有雄性，B分析错误；杂交组合二的F,相互交配，即AaXX×AaXY,F2暗红色眼果蝇的基因型为AX,比例为子×3-名，C分析正确：有雄性，B分析错误；杂交组合二的F,相互交配，即AaX"X×AaXY,F2暗红色眼果蝇的基因型为AX_,比例为子×名，C分析正确：F,的暗红色眼雌果蝇与丁杂交，属于测交，可用于验证题干中的假设，D分析正确。