【单选题】The temperature at which the air is saturates with water vapor and below which condensation of water vapor will occur is referred to as the _____.
【单选题】Customer: Excuse me, sir. Clerk: ______.Customer: I'd like to cash a check. Would you please tell me which window should I go to? Clerk: You can cash checks over there at window 6.
【单选题】The Smiths are at home. Bill is listening to the music. Mother said to her son, 'Bill, Would you please _____ a little, your baby brother is sleeping.' [ ]