Over 100,000 chemical reactions _____ the brain every second.
举一反三
- The changes of chemical reactions include:
- In chemical reactions, all electrons rearrange around the nuclei.
- All chemical reactions in the body are catalyzed by enzymes. A: 正确 B: 错误
- I see Mary _________ day in school. I know her very well. A: every the second B: every second C: the every second D: the second
- Nuclear rockets, in contrast to their chemical 17）________, could impart a maximum speed of up to about 22 kilometers a second.