口腔上皮细胞和洋葱表皮细胞共有的结构是（  ）

       The umbrella is a very common object. It keeps the1   and the sun off the people. Most umbrellas can be folded up(折叠) so it is  2 to carry them.

     However, the umbrella has not always been as   3  as it is now. In the past, it was a symbol of importance. Some African countries still use umbrellas in this   4. Someone carries an umbrella and walks behind the king or important person.

     Umbrellas are very old. People in different parts of the world began to   5  umbrellas at different times. The Chinese had them more than 3,000 years ago. From there , umbrellas 6   to India and Egypt. In Greece and Rome,  7 wouldn't use them. They believed umbrellas were only for women.

     England was  8   the first country in Europe where common people used umbrellas against rain. The weather there is very  9  and umbrellas are very useful.

     Everybody uses umbrellas today. The next time you  10   one, thinking that for centuries only great men and women used them, you'll feel you are important people, too.

某同学在微博中写道:“随着期中考试的临近，我心里越来越烦躁不安，彻夜难眠，我害怕考不好，对不起父母和老师……”下列描述符合该同学状态的是（   ）。