Recently, a new planet was discovered, which is about 31 light years away. Scientists haven’t seen it in fact, but they’ve been able to calculate its size and weight by watching its influences on the star that it orbits. It appears that this planet is mainly made of iron.“From our...
The researchers had been observing the stars ___ a new planet was discovered. A. when B. before C. while D. after 相关知识点: 试题来源: 解析 B。“before”表示在新行星被发现之前,研究者们一直在观察星星,过去完成进行时突出观察这个动作的持续。反馈 ...
Recently, a new planet was discovered,which is about 31 light years away. Scientists haven't seen it in fact, but they've been able to calculate(计算) its size and weight by watching its influences on the star that it orbits(沿轨道运行). It appears that this planet is mainly made of...
解析 A。本题考查被动语态的一般现在时。原句是主动语态,变为被动语态时,be+过去分词,主语是 a new planet 单数,且时态是一般现在时,所以用 is discovered。B 选项 was discovered 是一般过去时的被动语态;C 选项 discovers 是主动语态;D 选项 discovered 缺少 be 动词,不是被动语态。
相关知识点: 试题来源: 解析 B。解析:“recently”表示最近,句子描述的是过去发生的事情,新星球被发现,所以用一般过去时的被动语态was。A选项has been是现在完成时的被动语态;C选项is是一般现在时;D选项will be是一般将来时,不符合语境。反馈 收藏
The scientists will discover a new planet in the future. A new planet ___ by the scientists in the future. A. will be discovered B. is discovered C. was discovered D. has been discovered 相关知识点: 试题来源: 解析 A。解析:一般将来时主动语态是will+动词原形,这里是will discover。一般将...
1It is reported that a new planet has been discovered recently. It's ___ Earth, and hopefully it can support human life. [ ]A. almost three times the size of B. three times the size than C. three times almost as large as D. almost three times as larger as 2 It is reported...
The ___ discovered a new planet. A. scientist B. teacher C. doctor D. artist 相关知识点: 试题来源: 解析 A。本题考查名词辨析。根据“discovered a new planet”可知是科学家。scientist 科学家;teacher 教师;doctor 医生;artist 艺术家。反馈...
It is said that the new planet was discovered ___. A. by accident B. on purpose C. in danger D. in trouble 相关知识点: 试题来源: 解析 A。本题考查短语的用法。“by accident”表示“偶然;意外地”,符合发现新行星的语境。“on purpose”意思是“故意地”,不符合发现新行星的情况。“in dange...
A. A new planet was discovered by the scientist. B. A new planet were discovered by the scientist. C. A new planet is discovered by the scientist. D. A new planet are discovered by the scientist. 相关知识点: 试题来源: 解析 A。“planet”单数,一般过去时被动 was。B 选项 were 错;C ...