【单选题】Topic 26 Session 1 4-1 Read the sentence pairs. Choose which word or phrase best fits each blank. 1-B A ____________________ is an observable occurrence.
【单选题】Topic 26 Session 1 4-1 Read the sentence pairs. Choose which word or phrase best fits each blank. 1-A A ____________________ is caused by a human error in coding or input.
【单选题】Topic 26 Session 1 4-4 Read the sentence pairs. Choose which word or phrase best fits each blank. 4-B The ___________________________________ detects implementation faults.