小明和小李、小凯三人读同篇朗读稿，小明用了$\frac{2}{15}$小时，小李用了$\frac{1}{6}$小时，小凯用了$\frac{3}{10}$​小时，谁读得最快？（　　　　）

在正方体ABCD﹣A₁B₁C₁D₁中，（$\overrightarrow{A_1{D}_1}$﹣$\overrightarrow{A_{1}A}$）﹣$\overrightarrow{AB}$=（　　）

根据短文选择正确答案。

The future is coming! All over the world there are many new ideas(想法) for new places to live and work in. Some of them will be in the sea! They will be very big and lots of people will live and work in them. The Americans are planning to build a town called Atlantis City. It will be in the sea，about five miles away from the land. But the most exciting idea comes from Japan. It is called Acropolis. Acropolis will be a huge sea city, with parks, schools, a hospital and an airport. And it will move! It will travel slowly around the world. There are just two problems. Acropolis will cost (花费) a lot of money to make. And for people who get seasick, it won't be much fun.

补写出名篇名句中的空缺部分。