Gelation is not an essential step.
举一反三
- Which step is the most important for you to buy a good computer （） A: The first step. B: The last step. C: The fifth step. D: The second step.
- He is improving step ____step. A: after B: by C: in D: for
- She learned the rules of the games step （ ） step. A: of B: to C: by D: in
- She learned the rules of the game step ______ step. A: in B: by C: up D: at
- She learned the rules of the game step _____ step. A: by B: on C: to D: down