[题目]He never said that he was good at mathematics, ?A. was he B. awns’t heC. did he D. didn’t he 题目和参考答案——青夏教育精英家教网—

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【题目】He never said that he was good at mathematics, ?

A. was he

B. awns’t he

C. did he

D. didn’t he

【答案】C

【解析】反义疑问句，前否定，后肯定；never从不，后面用肯定句。

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【题目】阅读材料，完成下列要求。

材料一我国是最早发明植桑养蚕织丝绸的国家。秦汉时代，黄河中下游地区农村，户户房前屋后种了桑麻，有的富户拥有上千亩的桑麻。那时候，桑麻种植开始向南发展到湖北、湖南和四川，向北发展到今天的内蒙古地区，汉朝的丝织品，以临淄和襄邑（在今河南）所产最为有名。那里的丝织品，种类多，产量大，有名贵的锦、绢、纱等……丝织业经过唐末五代及北宋一个长时期的发展，大大改变了唐中叶以前的面貌。北宋时，丝织业的产地逐渐形成江浙和四川两个中心……整个沿海地带都比较发达。

——《简明宋史》

材料二中国古代人口地理分布的变化（人口密度：人/平方千米）

——《简明宋史》

材料三渭水上游的陇山山脉，秦汉时代一片葱笼。秦岭及其北麓在汉代被人称为“陆海”。然而，关中作为许多朝代帝王的京畿重地，建筑宫室，营建坟墓，所耗树木无法计算，其中主要是就近砍伐。唐代以后，渭水的流量已经明显减少，航运也就不见记载。秦岭北麓的森林至今早就无影无踪了。

——《沧海神州·中国历史地理谈丛》

（1）根据材料一，概括说明我国古代丝绸生产格局的变化。

（2）根据材料二、三并结合所学知识，分析我国古代丝绸生产格局变化的原因。

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