单项选择题
Lines drawn through points on the earth having the same atmospheric pressure are known as（）.
A.isothermal B.millibars C.isobars D.seismics
单项选择题 My ship（）heavy weather during this voyage.
单项选择题 My ship sailed（）port of Shanghai, bound（）Rotterdam.
单项选择题 My ship’s engine responds well to telegraph orders and takes about 80 seconds to reverse from full speed ahead to full speed astern. This sentence（）.
