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What is the major advantage of a rhumb line track？（）

A.The vessel can steam on a constant heading（disregarding wind，current，etc）
B.The rhumb line is the shortest distance between the arrival and departure points
C.It is easily plotted on agnomonic chart for comparison with a great circle course
D.It approximates a great circle on east-west courses in high latitudes

单项选择题

What caused a change in the author’s understanding of keeping a diary？（）

A.A dull night on the journey.
B.The beauty of the great valley.
C.A striking quotation from a book.
D.Her concerns for future generations.