问题

as Newton was, many of his ideas_______ today and are being modified by the work of scientists of our time.

A:are to challenge
B:may be challenged
C:have been challenged
D:are challenging
正确答案是:
同类题型

I haven’t finished my composition. I ________ for two hours and a half.

Kathie is reading the note which ______ in the drawer the other day.

The rare fish, _____ from the cooking pot, has been returned to the sea[ ]

下列各句中划线成语的使用,全都正确的一项是( )①雾霾危及人类的生存环境,对人类健康造成威胁,因此对待雾霾不能听天由命,民间要有积极行动,政府应有更多的担当。②山东省电力公司研究的机器人“大白”如雷贯耳,它们因多次出色完成变电站巡检中的急难险重任务,被誉为坚守电网安全的“智慧卫士”。③大文豪鲁迅先生怀着对儿童的爱和希望,翻译并创作了一批优秀的儿童文学作品,展现出清新的写作风格,成为中国现代儿童文学的始作俑者。④抗日战争时期,汪精卫等人投靠日本,建立伪国民政府,这些人沐猴而冠,卖身求荣,是会被永久钉在历史的耻辱柱上的。⑤守纪律、讲规矩是中国共产党的优良传统和独特优势,自中共一大通过党的第一个纲领开始,不同形式下的各种规章应运而生,不绝如缕。⑥相关部门应加大工作力度推动东中西部义务教育的均衡发展,财政经费要更多地支持薄弱地区,要少一些锦上添花,多一些雪中送炭。

I left my handbag on the train, but luckily someone gave it to a railway official. — How unbelievable to get it back! I mean, someone _____ it. [ ]