单项选择题
There is always excitement at the Olympic Games when an athlete breaks a previous record of performance.（）
A．beats B．destroys C．maintains D．defends
单项选择题 The expedition reached the summit at 10:30 that morning（）
单项选择题 We packed up the things we had accumulated (积累) over the last three years and left. （）
单项选择题 Since ancient times people have found various ways to preserve meat（）
