青书学堂: (单选题) Scientists photographed for the first time ever _____ wild gorillas used a stick to test the depth of a pool before getting into it, according to a recent study.
举一反三
- 青书学堂: (单选题) A historical study of language is a ____ study of language.(本题3.0分)
- ---Have you ever traveled abroad?---Sure. I _______ business in the USA. A: will study B: was studied C: was used to study D: used to study
- What should you do to prepare for tests? A: Always study, study and study. B: Get familiar with the test material. C: Go in the test with confidence. D: All of the above.
- 青书学堂: (单选题) 单选:设D=
- __________ is the study of how time is used in communication.