【中外历史人物评说】阅读材料，并回答问题：

材料一：        康熙诗《昭君墓》

南北分天地，存亡见庙谟。含悲辞汉主，挥泪赴匈奴。

目睹当年冢，心怀四海图。葆旌巡远徼，蕃落效驰驱。

欲笑和亲失，还嫌饵术迂。开诚示异族，布化越荒途。

漠漠龙沙际，寥寥雁塞隅。偶吟因有触，意独与人殊。

材料二：康熙皇帝曾说：“朕阅经史，塞外蒙古多与中国抗衡，溯至汉唐宋至明，历代俱被其害，而克宣威蒙古，并令归附，如我朝者，未知有也。夫兵者凶器，圣人不得已而用之，譬之人身疮疡，方用针灸，肌肤无恙，而妄寻苦楚可乎？治天下之道亦然，乱则声讨，治则抚绥，理之自然也。自古以来，好勤远略者，国家元气，罔不亏损，是以朕意不以生事为贵。”

   The sun, the moon and the stars(星星)are all in the sky. We see the moon and the stars at night. The sun is a ball. It's much bigger than the moon. It gives us heat(热量). The sun has a family. It's the biggest member of the family. The moon is a ball, too, like the sun and the earth. Sometimes it looks as round as a plate(盘子). Sometimes it looks half a plate. It looks bigger because it's much nearer to the earth. It's much smaller than the sun. It's smaller than the stars. The light on the moon comes from the sun. It has no light of its own.
   The stars look smaller than the sun. They look small because they are very far away from us. All day the stars are in the sky. But the light from the sun is too bright. We can't see the stars in the day.

-- Who is your English teacher, Helen?

-- __________ is.