根据短文理解，从A、B、C三个选项中选择最佳答案填空。

    A young father was visiting an old man. They were standing in the old man's garden and  1  children. The young man said, "How strict should parents be  2their children?" The old man pointed to a line3 a big, strong tree and a thin, 4  one. "Please untie the line," he said. The young man 5 so, and the young tree bent(弯曲) over to one side.

    "Now tie it again," said the old man, "but first pull the line tight(紧紧地) so that the young tree is6  again." The young man did as the old man told him. Then the old man said, "It is the same with  7  . You must be strict with them, but sometimes you must untie the 1ine8 how they are getting on. If they are not yet able to stand alone, you must tie the line tight 9 . But when you find that they are ready to stand alone, you can take the10   away."

在“探究两个共点力的合成”实验中，某小组做实验时得出如图所示的图（O为橡皮条与细绳套的结点）．图中____是F₁与F₂的真实值，____是F₁与F₂的实验值．

某实验小组为了验证绿色植物进行光合作用是否需要光,设置了如下装置,正确的组合是（  ）

《朗读者》是中央电视台最新推出的一档大型文化情感类节目。该节目以个人成长、情感体验、背景故事与传世佳作相结合的方式，选用精美的文字，用最平实的情感读出文字背后的价值，旨在实现文化感染人、鼓舞人、教育人的传导作用，展现有血有肉的真实人物情感。节目不仅展现出传统文化蕴含的魅力，更是让无数观众为文化痴迷。这种返璞归真的制作方式一经亮相，便让人眼前一亮，节目播出后备受好评，不少网友表示：“这是文化传播的又一股清流。”

结合材料，运用《文化生活》知识，简析《朗读者》成为“一股清流”的原因。