阅读下面这首宋诗，完成下列小题。

唐崇徽公主手痕^①

欧阳修

故乡飞鸟尚啁啾，何况悲笳出塞愁。

青冢埋魂知不返，翠崖遗迹为谁留？

玉颜自古为身累，肉食何人为国谋。

行路至今空叹息，岩花野草自春秋。

【注】①崇徽公主，唐代宗时与回鹘和亲，以崇徽公主嫁其可汗。姓仆固氏，唐朝著名将领仆固怀恩的女儿。生卒年不详。手痕：在今山西灵台。传说公主出嫁回鹘时，路经此地，以手掌托石壁，遂有手痕。

    Chinese has been added to the graduation exam list by Sophie School, an Italian high school and 29 students will take the test this year. This high school is mainly about language in northeastern Italy. It has become the first school in the country to list Chinese as a graduation exam subject. The Chinese course has been taught at this Italian school for 5 years, and 145 of its 910 students have chosen to study Chinese. Maria, director of the school, said Chinese will become a global (全球的) language in the future and they set up the course because many students had asked for it. "There were only a few schools in Italy which provided Chinese courses then, but now, Chinese courses have become an important part of our teaching plan," she said.

    Robert is a student in this school. He is going to take the Chinese test this year. He said that Speaking Chinese is not so difficult, it was difficult for them to understand the same word in different sentences and read Chinese poets, but writing Chinese characters (汉字) is the most difficult part of learning the language. "Although learning Chinese is difficult for Italian students, when considering looking for better jobs abroad, China must be my top choice," he said.

水的物态变化是许多天气现象形成的重要原因，下列天气现象的形式，与水的物态变化无关的是（　　）

下图表示在某晴天的上午，将一盆植物的部分枝叶用干燥的透明塑料袋罩住，扎紧袋口并置于阳光下。一段时间后，塑料袋内壁上会出现小水珠，这是植物____作用的结果。