每题给你一个数列。但其中缺少一项，要求你仔细观察数列的排列规律综合判断。然后从四个供选择的选项中选出最恰当的一项。来填补空缺项。
3，3，6，24，( )。
A．192
B．168
C．81
D．48
参考答案：A
解析： 本题正确答案为A。后项除以前项后得到一组数列为1，2，4…，可知该数列为公比为2的等比数列，故空缺项为24×8=192。
阅读下面短文，根据内容完成表格中所缺信息。（每空一词） Writing a thank-you letter can be a great way to express (表达)thanks for a favor (帮助；恩惠) someone did for you. Consider these following steps when writing your letter, which will help make your thank-you letter more meaningful (有意义的) and sincere(真诚的). Before you start, buy some special stationery, such as nice paper or blank cards. The stationery doesn’t have to be expensive, since even one-dollar card can be very nice. And you must decide whether you prefer to type your letter or write it by yourself. Handwriting has a more personal feeling, while a printed（打印的） thank-you letter looks more professional (专业的). Now, you can start writing. You should express your purpose(目的) from the beginning. Start your letter by thanking the person for the gift or service he or she provided. Then you should explain how you plan to use the gift or service, or explain how the gift or service has already been used. What’s more, you can also express your feelings on the gift or service by saying that “It was a wonderful birthday present…” It also helps to mention a personal feeling such as “I was just so happy with the party.” In the end, you should mention that you want to see or talk to the person again soon. For close relatives and friends, you can also tell them how much you miss them and express regret(遗憾) that their visit was short. Sign your thank-you letter personally and with a heart. Try “Love”, “Yours truly”, or “Take care” instead (代替) of “Sincerely” as it is more for business. In this way, you will always maintain (维持) a pleasant relationship(关系) with your friends and relatives. Title: How to Write a 小题1: Letter
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