单项选择题

Oil is derived from the ______ of microscopic sea creatures, and is even older, according to most geologists.

A．layouts
B．reminders
C．remains
D．leftovers
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They teach the vocabulary of the English used in computer science, which is also listed ______ in the glossary.
A．in sum
B．in total
C．in general
D．in full
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This will make schools mole directly and effectively ______ to parents, and more responsive to their criticisms and wishes.
A．accountable
B．submitted
C．subjected
D．available
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