Help
End Section Review
End Exam
Answer Edit Confirmation
课程
活动
资料
反馈
题目内容
The 1840s were time for young women beginning to study science, particularly astronomy, in 1847 Maria Mitchell discovered the Nantucket comet, the first of several important astronomical discoveries of the era.
学员17tpjh
学员19ckhj
学员17cpwp
学员13fcre
学员15cevt