中国大学MOOC: Sip and zip, tip and dip, map and nap are all （ ）
举一反三
- Sip and zip, tip and dip, map and nap are all __.
- Crops may suffer if temperatures _________ below freezing. A: tip B: sip C: dig D: dip
- 中国大学MOOC: Which tip is NOT mentioned in the text?
- 中国大学MOOC: I need to take a nap to _________ myself.（单选）
- 中国大学MOOC:"To tip a barman or barmaid, it is customary to tell him to __________.";