For years, biologists have known that chimpanzees and even some monkeys produce apantingsound akin to human laughter.
A: rocking
B: gasping
C: vibrating
D: resonating
A: rocking
B: gasping
C: vibrating
D: resonating
举一反三
- We each other since known; ten years ago. A: have known; ten years ago B: knew; ten years ago C: have known; ten years D: knew; ten years
- This is one of the best students that I ______. A: even have known B: B. have ever known C: know D: D. knew
- 中国大学MOOC: Studies have reported that chimpanzees can be infected _____ HIV-1 and human AIDS-like symptoms appear.
- 2. Why do human beings have a larger brain compared to chimpanzees? A: Human beings always had a big brain that helped us to survive. B: Human beings have a bigger brain by cooking food over the fire. C: Human being have a bigger brain through the evolutionary process. D: Human beings have a bigger brain through eating fruits and berries. E: Human beings have a bigger brain through migration.
- I __________Tom for about ten years now. A: have been knowing B: have known C: knew