In general, the ancient Romans were a practical people. They cared less about philosophy and pure mathematics than【C1】______The Romans were【C2】______the ancient engineers and architects. They were【C3】______students of Greek geometry(几何学)and trigonometry(三角学), and applied their knowledge【C4】______the construction of fine bridges, roads, aqueducts(渠道), and public buildings. They knew about the【C5】______of iron ore, but they used the iron they produced mainly【C6】______spears, swords, and shields,【C7】______for building construction. While the Romans【C8】______practical wonders, they did very little theoretical scientific【C9】______. Because of their【C10】______wars, many of their inventions were【C11】______improvements in the design of Greek weapons with which they were【C12】______ There are two reasons【C13】______the Romans neglect of philosophy and pure mathematics. Firstly they were apparently【C14】______busy conquering nearby nations and【C15】______them into a rapidly growing empire to waste much time【C16】______abstract thinking.【C17】______, they were handicapped by the rigidity of their numerical system(Try to multiply XI by LVII or to divide CXLIII by IX; it simply cannot be done【C18】______pencil and paper.). The Romans did all of their arithmetic on【C19】______—the ancient counterpart of the modern computing machine. Their number system【C20】______the study of pure mathematics.

【C1】

A．that the Greeks had
B．the Greeks had
C．that did the Greeks
D．did the Greeks