题组2　科普知识
专题三　阅读了解　第三节　题组训练
A(·河东区一模)Do you ever wish for a little more time to do everything you need to do？Well，on July 1 you’ll be getting it—but only one more second.On July 1 at exactly 7：59：59 a.m.Beijing time (or on June 30 at 23：59：59 UTC，Coordinated Universal Time)，the world’s atomic(原子) clocks will pause for a single second，or，more precisely，change to the unusual time of 7：59：60，according to theverge.com.The addition of a leap second(闰秒)，announced by the Paris Observatory，is to keep our ...