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用所学的遗传、代谢等知识完成以下问题 下图A所示为人体内苯丙氨酸与酪氨酸的代谢途径，图中的数字分别代表三种酶。 上图B所示Ⅱ–1因缺乏图A中的酶①而患有苯丙酮尿症，Ⅱ–3因缺乏图A中的酶②而患有尿黑酸尿症，Ⅱ–4不幸患血友病（上述三种性状的等位基因分别用Pp、Aa、Hh表示）。一号和二号家庭均不携带对方家庭出现的遗传病基因。Ⅰ–3个体涉及上述三种性状的基因型是（）
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【简答题】????B “Are you crazy?” people around him shouted as Alex Bien, a 33-year-old immigrant(移民), ran toward three cars in a chain accident along the highway in Miami, which were burning down. Alex didn’t t...
【简答题】"Are you crazy?" people around him shouted as Alex mien, a 33-year-old immigrant(移民), rantoward three cars in a chain accident along the highway in Miami, which were burning down. Alexdidn&39;t think ...
【简答题】_______________________________ (必须立即采取有效措施) to keep our country, from going under.
【简答题】场效应晶体管是利用半导体表面的（ ）效应进行工作的。（两个字）
【单选题】Which sentence best describes the author’s opinion about steam cars?
A.
Despite all its advantages, nobody wants to have a steam car now.
B.
Cyclone Technologies has developed a new efficient steam engine, so soon steam cars will reappear in the market.
C.
Steam cars have been an important part of transport history, and some companies are still manufacturing them now.
D.
Steam cars were once popular but now only remain in the hands of enthusiasts.
【简答题】But are steam cars________ to the past, a now obsolete stepping stone in automotive history? Perhaps not.
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