下表列出了国外几个城市与北京的时差（带正号的数表示同一时间比北京时间早的时差数）。已知现在是北京时间上午八点，那么下列说法中，正确的是 。

（A）东京是上午七点
（B）巴黎是下午三点
（C）纽约是下午七点
（D）芝加哥是上午两点

The table below lists the time differences between several cities abroad and Beijing (numbers with a positive sign indicate the number of hours earlier than Beijing Time). Given that it is currently 8.00 am Beijing Time, which of the following statements is correct?

(A) It is 7.00 am in Tokyo

(B) It is 3.00 pm in Paris

(C) It is 7.00 pm in New York

(D) It is 2.00 am in Chicago

根据相关标准，六年级男生50米短跑合格成绩为10．5秒，把成绩超过10．5秒的部分用正数表示，不到10．5秒的部分用负数表示。某组6名男生的50米短跑成绩如下表：单位：秒

（1） 这一组几号同学50米短跑成绩最好？他用时多少？

（2） 这组同学50米短跑成绩不合格的人数是总人数的几分之几？

（3） 从这些数据分析中，你还能得出其它信息吗？

According to the relevant standards, the passing time for the 50-metre sprint for Year 6 boys is 10.5 seconds; any time exceeding 10.5 seconds is expressed as a positive number, whilst any time under 10.5 seconds is expressed as a negative number. The 50-metre sprint times for a group of six boys are shown in the table below: Unit: seconds

(1) Which pupil in this group achieved the best 50-metre sprint time? How long did it take him?

(2) What fraction of the total number of pupils in this group failed the 50-metre sprint?

(3) Can you deduce any other information from an analysis of these data?

如果 3 能整除a,a又能整除12 ，那么 a=             

If 3 divides a, and a also divides 12, then a =                    

如果两个整数a和b (a > b)都能被整数c整除，那么它们的和、差、积也能被c整除吗？为什么？

If two integers a and b (where a > b) are both divisible by an integer c, are their sum, difference, and product also divisible by c? Why?