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【单选题】Most gulls don"t bother to learn more than the simplest facts of flights how to get from shore to food and back again. For most gulls, it is not flying that matter, but eating. For this gull, though, ...
A.
They wanted to learn from Jonathan Livingston Seagull in practicing flight skills
B.
His parents encouraged Jonathan Livingston Seagull to improve his techniques
C.
They felt shameful when they saw the low flying by Jonathan Livingston Seagull
D.
They could not understand why Jonathan Livingston Seagull spent energy and time experimenting slides
【单选题】系、离作业前，应做下列哪些准备工作（）。 Ⅰ．船长应将操作要点及要求向有关人员介绍； Ⅱ．试验对讲机，保持联络畅通； Ⅲ．检查前后缆绳及泊位前后的情况； Ⅳ．试验锚机和绞缆机。
A.
Ⅰ～Ⅳ
B.
Ⅰ～Ⅲ
C.
Ⅱ～Ⅳ
D.
Ⅰ . Ⅱ . Ⅳ