Question

what is the primary safety measure to take during a tornado?
find shelter
open windows
try to outrun the tornado
remove wet clothing

Explanation:

龙卷风（tornado）是一种强烈的、小范围的空气涡旋，具有极大的破坏力。在龙卷风发生时，寻找遮蔽处（find shelter）是首要的安全措施。打开窗户（open windows）可能会使强风进入室内，增加危险；试图跑赢龙卷风（try to outrun the tornado）是不现实的，因为龙卷风速度极快；移除湿衣服（remove wet clothing）与应对龙卷风的安全措施无关。

Answer:

find shelter