Riothamus, a fifth-century king of the Britons, was betrayed by an associate, fought bravely against the Goths but was defeated, and disappeared mysteriously. Riothamus’ activities, and only those of Riothamus, match almost exactly those attributed to King Arthur. Therefore, Riothamus must be the historical model for the legendary King Arthur.
The argument above requires at least one additional premise. Which of the following could be such a required premise

A．Modern historians have documented the activities of Riothamus better than those of any other fifth-century king.

B．The stories told about King Arthur are not strictly fictitious but are based on a historical person and historical events.

C．Riothamus’ associates were the authors of the original legends about King Arthur.

D．Legends about the fifth century usually embellish and romanticize the actual conditions of the lives of fifth-century nobility.

E．(E) Posterity usually remembers legends better than it remembers the actual historical events on which they are based.

预制梁吊装采用起重机安装施工，在吊装施工中，监理工程师的监理要点是（）

A.正式安装起吊前应进行试吊检查，符合要求才能进行正式吊装。

B.检查现场吊装方案。

C.对拟使用的起重机进行检查。

D.对墩台面上的中心线、标高、支座位置进行检查。

E.起吊构件速度均匀，平稳升降，就位在固定前进行测量校正，符合要求后，才允许焊接或浇筑接缝混凝土