单项选择题 At last，the palm trees that fringe the natural harbor of Port Aloahoa come into view on the horizon lit by the setting sun.The meaning of this sentence is that （）.

单项选择题 As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.

单项选择题 Areas enclosed by a long and short dashed magenta line indicate （）.