第13题: [单项选择]● You will hear a talk given by Juliet Sharman.
● For each questions 23--30, mark one letter (A, B or C) for the correct answer.
● After you have listened once, replay the recording.Reliability improved steadily 参考答案:B 答案解析:“Reliability improved steadily from 99.1% in 1993 to 93.30% in 1995”。注意表时间的介词“in”。