【正确答案】
B
【答案解析】[解析] plentiful:充足的、足够的,例如:The hares are plentiful here.这儿野兔很多。steady:稳定的、不变的,例如:The membership of the coremittee stayed steady at eleven.委员会人数固定在11人。extra:额外的、另加的,例如:They Drovided extra trains during the holiday.假日期间他们增开列车。stable:持久的、稳定的,例如:The two countries remained stable relationship.两国关系保持稳定。