【单选题】According to the passage, all of the following contributed to deforestation EXCEPT
A.
the expansion of agriculture
B.
an increase in forest fires
C.
the use of charcoal as a fuel
D.
steamboat transportation
【简答题】What causes the deforestation and threatens the existence of Amazon forest?
【单选题】The word “deforestation” in paragraph 3 means
A.
forest damage caused by pollution
B.
moving population from forest to cities
C.
the threat of climate change
D.
cutting large areas of trees
【单选题】为缓解腹膜炎症和腹部术后病人腹膜对有害物质的吸收,采取的体位一般是
【简答题】试述 需 求 量变动与需求变动 的 区 别以 及 供 给量变动与 供给变动的区别, 并举 例说明 。
【单选题】It's decided that the present rate of deforestation(毁林) ______to continue.
【简答题】设总体X 的密度函数为 其中 是未知参数 是从该总体中抽取的一个 简单随机 样本.