格式条款和非格式条款不一致时，应当采用______。
参考答案：非格式条款
下列图形中：①平行四边形；②有一个角是30°的直角三角形；③长方形；④等腰三角形．其中是轴对称图形有（ ）个．
A．1个
B．2个
C．3个
D．4个
Until the start of the Industrial Revolution, mankind was poor, hungry, and constantly at the _______ of disease and natural disasters．
A．power
B．limit
C．control
D．mercy
