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A: Hello, this is Betty.
B: Hello, Betty. This is Larry. How many smoke detectors are on your ceiling?
A: I have two smoke detectors.
B: Do you have fresh batteries in both of them?
A: Both batteries are pretty fresh.
B: Very good. I have to come by there and check out all the detectors.
A: Very good, when do you think you'll be coming over?
B: I'll be by on Thursday at noon. You don't have to be there.
A: I won't be home. Just remember to lock my door, okay?
B: You won't even know that I've been there.
n. 检查，支票，账单，制止，阻止物，检验标准，方格图案
