具有重要历史、艺术、科学价值的文物，除经国务院批准运往国外展览的以外，______出境。
参考答案：一律禁止
把下面的分步算式列成综合算式
18+29=47
4×47=188
188÷2=94综合算式：______．
Many experts agree that once these treasures are _______ to the air, great harm will be done to them. So they think it better not to unearth the treasures.
A．exposed
B．threatened
C．constructed
D．conserved
