第二部分阅读理解(共4小题;每小题7.5分,满分30分)
阅读下面短文,从每题所给的A、B、C和D四个选项中,选出
最佳选项。
Digital stopwatches can make rounding(四舍五入的)
errors
of up to 0.11 seconds,which could be enough to change the win
ner of close races.Although the devices record time extremely
accurately,they often make errors when changing that raw data
to human-readable numbers.
Most digital stopwatches measure time by counting the pre-
dictable oscillations (of a quartz crystal.The crystal will
pulse many thousands of times a second and the final count is
transformed into seconds in a format known as a floating-point
representation that is commonly used by digital devices.