根据短文理解, 从A、B、C、D四个选项中选择最佳答案填空。

    Lucy and Lily 1 twins. They are twelve. They 2 a big and nice bedroom. There 3 two beds and two desks in the room. Lucy and Lily like milk and bread, but they 4 tea or meat. You can see some bottles of milk and some bread on 5 desks. But you can't see 6 tea or meat in the room. Lucy and Lily can play 7 football and fly kites. But they can't mend a bike 8 a radio. They are good 9. They 10 very much.

下列各句中，划线的词语使用正确的一项是（   ）

正项递增等比数列{$a_n$}中，$a_3{a}_7{a}_8{a}_{10}=81,a_5+a_9=\frac{51}{4}$，则该数列的通项公式$a_n$为（   ）

2.995精确到百分位是3