中国大学MOOC: C_______is a hole in a tooth, caused by decay.
举一反三
- Questions 17—20 are based on the following passage. According to Mr. Tait, what should we do to improve the situation of tooth decay A: Spend more money in fighting tooth decay. B: Have better education. C: Improve people’s standard of living. D: Get rid of some of our teeth.
- People<br/>need to brush ( )to prevent tooth decay. A: daily B: day C: dayly
- 中国大学MOOC: Pseudodominance is caused by
- 中国大学MOOC: The flood has caused ______ in the village.
- 中国大学MOOC: Which of the following is not caused by genetic difference?