1.若规定精确到1,那么$\sqrt{60}$的估算值为( )
0 284661 284669 284675 284679 284685 284687 284691 284697 284699 284705 284711 284715 284717 284721 284727 284729 284735 284739 284741 284745 284747 284751 284753 284755 284756 284757 284759 284760 284761 284763 284765 284769 284771 284775 284777 284781 284787 284789 284795 284799 284801 284805 284811 284817 284819 284825 284829 284831 284837 284841 284847 284855 366461
| A. | 3 | B. | 7 | C. | 8 | D. | 7或8 |