材料一：上古之世，人民少而禽兽众，人民不胜禽兽虫蛇，

——《韩非子》

材料二：在北京人遗址中，发现了大量木炭和几处较大的灰烬堆，还有在火中烧过的石块、兽骨和树籽等。

材料三：上古之世……民多疾病：有圣人作，钴燧取火以化腥臊，而民说之，使王天下，号之日燧人氏。

——《韩非子》

下图表示外界气温改变时，皮肤中血管的舒缩情况。

将一根圆木锯成3段要12分，再将每段平分成两份，还要（　　）分钟．

    passage 1

    Articles Wanted

    School Life

    Articles should be typewritten and double spaced, using only one side of the page.

    Your name, year of birth, school name (and English teacher), home address and e-mail address must be included.

    For photos, place the information on the back of each envelope: PLEASE DON'T FOLD.

    Please keep copies of your text, pictures or photos.

    The sentence MUST BE WRITTEN with your name on each work, "I promise the above work is completely original (原创的)."

    If your article is chosen, you will receive a copy of School Life and a special gift.

    SEND IT ALL SUMMER!

    For more information, please contact (联系) us!

    Tel: (0417) 381361 (0417) 386743

    E-mail: schoollife@acpmagazines.com.

    Mail: School Life. Box 5252, Yingkou, NSW 200

近代中国政体经历了从君主专制到民主共和制的转型。建立中国第一个共和制政府的事件是（   ）