【单选题】It can be inferred from the passage that the Greek word polis means ______.
【单选题】Members of Youth clubs are encouraged to participate ail of the following activities except______.
【单选题】卡普隆又称尼龙6,是聚酰胺纤维之一种,它的单体是己内酰胺和()
【单选题】Words ______ meaning, as we ail know.
【单选题】Currently, almost ail the flagship chipmakers in that country are owned by American investors.