单项选择题
If you are on the beach and are signaling to a small boat in distress that your present location is dangerous and they should land to the left，you would（）.
A.fire a green star to the left B.send the letter K by light and point to the left C.place an orange signal to your left as you signal with a white light D.send the code signal S followed by L
单项选择题 If we had stayed at that port much longer，we（）the tropical storm.
单项选择题 If an airplane circles a vessel 3 times，crosses the vessel’s course close ahead while rocking the wings，and heads off in a certain direction，what does this indicate?（）
单项选择题 Distress signals may be（）.
