读 《岳阳楼记》，用原文语句填空。

①文中动静结合，描写洞庭湖月夜美景的句子是：____，____。

②表现迁客骚人因物而喜的两个四字句是：____，____。

③“是进亦忧，退亦忧”一句中，“进”指的是____，“退”指的是____。

“古仁人”能够做到“进亦忧，退亦忧”的原因是____，____。

把儿歌补充完整。

收听广播____ ____ ____ ，

青青山坡____ ____ ____ ，

两个门洞____ ____ ____，

一尊佛像 ____ ____ ____。

    Have you ever picked up a pen to write some characters, but you can't ____(记得) what they look like?

    You're not alone. CCTV-10 started a show ____(叫做) Chinese Character Dictation Com-petition (《中国汉字听写大会》) last year. On the show, only three out of 10 adults____（正确地）wrote bingjiling (ice cream 冰激凌), and no one could   write out penti (sneeze喷嚏). According to a survey, 94.1% of people said they had memory lapses (差错) when ____(写) some characters.

    It seems that Chinese characters are in danger. Since the digital(数码) age began, fewer and ____(少) people use pens and paper. Most people now write Chinese on keyboards using pinyin. As a____(结果), many people would forget the features（特征）of a Chinese character, such as its structure and ____（意思）easily.

    Chinese characters are one of the world's____（古老的）written languages, dating back (追溯到) to 1100 BC. It's not only a way for us to record things,____（而且）it's important to pass on Chinese culture. For example, the character nan (male男) is made up of two____(部分), tian (farmland田) and li (strength力). We can tell from it that in the old times Chinese men were in charge of (负责) working on the farmland.

如果让你探究“种子的萌发需要水分吗？”，你选定的变量是（　　）