And it is imagined by many that the operations of the common mind can by no means be compared with these processes, and that they have to be required by a sort of special training.
【正确答案】正确答案：许多人认为，普通人的思维活动根本无法与科学家的思维活动相比，这些思维活动必须经过某种专门训练才能掌握。
【答案解析】解析：本句结构为形式主语it引导两个由that引导的并列主语。