【单选题】20、Builders seem not willing to put up small homes for young married couples because____.A. there is no market demand for small housesB. america is a nation impotent to house it's young peopleC. most young people would dream of having larger homesD. it is not very lucrative for builders to put up small houses

本题考查对语篇逻辑关系的理解和推理能力。题目要求分析建筑商不愿为年轻夫妇建造小户型房屋的根本原因。解题关键在于抓住选项中隐含的经济因素，而非单纯关注表面现象（如需求或个人梦想）。需结合常识判断建筑商的商业行为逻辑，明确利润驱动是其决策的核心。

选项分析

A. there is no market demand for small houses
错误。题目中提到“young married couples”（年轻夫妇）对小户型的需求是客观存在的，因此“无需求”与事实矛盾。

B. America is a nation impotent to house its young people
错误。该选项将问题归因于国家整体能力不足，但题目讨论的是建筑商的主动选择，而非系统性缺陷，表述过于绝对化。

C. Most young people would dream of having larger homes
部分正确但非关键。虽然年轻人可能更向往大房子，但这属于个人理想，并非建筑商拒绝建造小户型的直接原因。

D. It is not very lucrative for builders to put up small houses
正确。建筑商作为商业主体，首要考虑利润。小户型房屋的建造成本与利润空间有限，无法带来高回报，因此建筑商更倾向于建造利润更高的大户型房屋。