危机干预的最低目标是保护当事人，预防各种意外。 ( )
参考答案：对
声波时差越大，地层传播速度越大。
According to the passage, what is the major interest of the officials of Glacier National Park
A．To limit land development around the park.
B．To establish a new park in Montana.
C．To influence national legislation.
D．To settle border disputes with Canada.
