The survival of the civilization as we know is_________ threat.

A． within

B． under

C． toward

D． upon

[单选题]Thesurvivalofcivilizationasweknowitis_____threat.(A)within(C)towards(B)under(D)upon

[单选题]Thesurvivalofcivilizationasweknowitis_____threat.(A)within(C)towards(B)under(D)upon

[单选题]From the last sentence of Paragraph 2, we may learn that the survival of a

[名词解释] survival analysis

[单选题]F．rom the end of the first paragraph we know that ________.A． children are more friendly to strangersB． American schools are not safe for kidsC． children often follow their parents’ behaviorD． fighting each other is part of children’s nature

[单选题]Survival Kit指的是（）。A . 急救箱B . 应急医疗箱C . 卫生防疫包D . 救生包

[单选题]A．) environmentB．) civilizationC．) communityD．) culture

[单选题]Our modern civilization must not be thought of as ________ in a short period of time.[A] being created[B] to have been created[C] having been created[D] to be created

[名词解释] 生存概率(survival probability)

[名词解释] survival factors (存活因子)