雅思阅读第334套P3：Read the text below and answer Questions 27-40

TF阅读真题第726篇The Horse and the Camel in Early China

TF阅读真题第788篇Canals and Railroads in the Early Nineteenth Century

雅思阅读第209套P2：Photovoltaics on the rooftop A natural choice for powering the family home

雅思阅读第263套P2：Venus in transit

雅思阅读第305套P2：Patients Are a Virtue

雅思阅读第328套P2：The Brains Business

雅思阅读第261套P2：Second nature

雅思阅读第298套P3：Should space be explored by robots or by humans?

TF阅读真题第718篇Glacier Flow and Surging