四个连续的自然数的积为1680,它们的和为( )。
A.26
B.52
C.20
D.28
参考答案:A
解析: 可用排除法进行判断,答案为26,四个自然数为5,6,7,8,应选A。
Our city has experienced ___this year as it did last year.
A.twice as much rain
B.rain twice as much
C.as twice much rain
D.twice rain as much
《人民警察法》第16条规定,公安机关因侦查犯罪的需要,根据国家有关规定,经过严格的批准手续,( )采取技术侦察措施。
A.应该 B.必须C.应当 D.可以