税收保全措施是指当事人不履行法律、行政法规规定的义务,有关国家机关告诫和限期缴纳无效的情形下,采用法定的强制手段,强迫当事人履行义务的行为。( )
参考答案:错
Some scientists think that it may take ______ years to make robots look like people, and do the same things as us.
A.hundreds of
B.two hundreds of
C.two hundreds
D. hundreds
一只羊用一根长5米的绳子拴在树上,它可以吃到多大面积的草?