单项选择题
From the second paragraph of the passage we know that the power of very high waves striking the shore is ______.
单项选择题 According to the passage, destruction caused by high waves occurs ______.
单项选择题 We know from this passage that out at sea, when waves going in opposite directions meet, their force ______.
单项选择题 The most important thing in providing first aid is to ______.
