先通读下面的短文，掌握其大意，然后从A、B、C、D四个选项中选择可以填入空白处的最佳答案.

Dear Grandmother and Grandfather,

    How's it going? Last Sunday I went to Long Bay with my1．We got up at 6：30 in the morning．We ate breakfast at 7：00，2then we left for Long Bay．My father is a good driver and he3fast．But I have to say, the trip was a little4．When we got there,5was already(已经)ten o'clock.

    Frist we swam and played balls in the water6 over an hour. After that，we ate a big lunch in a restaurant．In the afternoon my mother and I7the sunshine on the beach．My father went8．He didn't get any fish．but it was9．Soon it was time to go home.My parents and I10Long Bay．What a great day we had!

    I will visit you with my parents this weekend．I miss you very much．

    Kate

阅读材料，回答问题

材料：我国人口约占世界总人口的21%，占亚洲总人口的 ，是欧洲人口的近2倍，美国人口的4倍、日本人口的10倍。目前我国60岁以上的人口已占10%，65岁以上的已达7%．据预测，到21世纪中叶，我国的老年人可能超过4亿，80岁以上的老人可能超过1亿。

下列各项，划线成语使用不恰当的一项是（   ）