My father used to work in the city and seldom stayed at home. But he would come back help to harvest(收割) rice every year.

One autumn, he promised to help our neighbor, who lost his arms in a traffic accident in 1999, to harvest his rice. After Father harvested our town, his little rice picker broke. What's worse, he had to return to work the next day because his partner was ill in hospital. It meant that Father wouldn't be back in a few days. It now seemed impossible to help out the neighbor.

Father told us that be wouldn't let the neighbor's rice rot( 糜烂) in the field. He decided to harvest it by hand without a machine. “If tonight's weather is clear, I think I can do it." added my father. In fact, he was rather tired after a day's harvest work.

After dinner, Father had a short rest and made his way to the field. A full moon was glowing (发光) in the sky and the weather was cold but clear. He spent the whole night keeping his word.

I would never forget the image(画面)：Father was cutting rice in the light of the harvest moon. Behind him, row after row of rice stocks(秸秆) stood at attention, showing respect for a man who kept his word.

把蚕豆植株放在湿润的空气中照光一段时间后，取蚕豆叶下表皮制作临时装片，先在清水中观察，然后用0．3g/mL蔗糖溶液取代清水，继续观察，结果如下图所示。对此现象的推断最合理的是（　）

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【清】蒋士铨

      铨四龄，母日授四子书①数句。苦儿幼不能执笔，乃镂竹枝为丝断之，诘屈作波、磔②点画，合而成字，抱铨坐膝上教之。既识，即拆去。日训十字，明日，令铨持竹丝合所识字，无误，乃已。至六龄，始令执笔学书。

      记母教铨时，组绣纺③绩之具，毕陈左右；膝置书，令铨坐膝下读之。母手任操作，口授句读，咿唔之声，与轧轧相间。儿怠，则少加夏楚④，旋复持儿而泣曰：“儿及此不学，我何以见汝父！”至夜分，寒甚，母坐于床，拥被覆双足，解衣以胸温儿背，共铨朗诵之；读倦，睡母怀，俄而母摇铨曰：  “可以醒矣！”铨张目视母面，泪方纵横落，铨亦泣。少间，复令读；鸡鸣，卧焉。

     【注释】①四子书：《大学》、《中庸》《论语》、《孟子》。②波、磔（zhé）：汉字书写笔画。③组绣纺：即编织结线。④夏（jiǎ）楚：用于责打的大条等。