中国大学MOOC:"Why do scientists know black holes exist?";
举一反三
- Why do the scientists want to find the missing amphibians?
- 中国大学MOOC: Do you know ________ this time yesterday?
- 中国大学MOOC: 10. Do you happen to know ______?
- Mr. White: () Spanish, Mrs. Black Mrs. Black: Pretty well. But I have a lot of trouble with spelling. Mr. White: How many languages do you speak Mrs. Black: I speak four languages. A: How do you know well B: How do you well know C: How well do you know D: How well you do know
- 中国大学MOOC: Why do humans explore space?