【文章內(nèi)容簡(jiǎn)介】
pipes too noisy! not clear! very clear electrical signals electrical signals conference calling A B C D E call waiting A B C A B B c redirection Find some words to plete the sentences: 1. If you don’t know the telephone number of a certain unit, you may look it up in the telephone d________. 2. This kind of food will s__________you up after your illness. 3. Please r________ all the letters to the following addresses. irectory t