题目选项分析

A pair of architects in Britain, who say that giant arches, bridges, and walls made of artificial bone could be easier to design and to build than with conventional structures, have already designed a number of structures, including a bridge, which shows how their idea would work.

A pair of architects in Britain, who say that giant arches, bridges, and walls made of artificial bone could be easier to design and build than conventional structures, have already designed a number of structures, including a bridge, to show how their idea would work.