皮皮学，免费搜题
登录
搜题
【单选题】
人们根据种种迹象判断,在天王星之外一定还有一颗行星,全世界天文学家进行了长期观察和探寻,一直没有发现。后来,科学家们暂时避开直接搜寻,转入该未知行星的轨道计算,根据求得的轨道参数反推,人们很快便找到了这颗新星:海王星。运用的是创新学的( )。A.
迂回原理
B.
移植原理
C.
变相原理
D.
还原原理
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】It was a long time ______ the neighbors found that the old lady had been dead of cold.
A.
when
B.
until
C.
since
D.
before
【单选题】The old lady had a ______ escape when she pass across the road in front of the bus.
A.
close
B.
short
C.
narrow
D.
fine
【单选题】The old lady had two clever sons, ____ did a good job in the 2010 National College Entrance Exam, though.
A.
none of them
B.
both of whom
C.
none of whom
D.
neither of whom
【简答题】While she was going downstairs, the old lady had her leg (break)______.
【单选题】The old lady had expected to see all her relatives when she was ill in hospital, but none came to see her ______ many of her neighbors offered their help．
A.
when
B.
as
C.
because
D.
while
【简答题】Seeing that the old lady had no chair ___, the boy offered her his own. A, to sit B to be seated C. to seat herself D. to sit on
相关题目：