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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
【多选题】5、广义成本定义包含的三层涵义有（ ）。
A.
成本是为达到一定目的而发生的
B.
成本是一种资源的耗费
C.
无目的的耗费也是成本
D.
成本必须是能够用货币来计量的