单项选择题

Those __ have six or more close friends are likely to describe themselves as "very happy".

A．who
B． whose
C．which
D．they
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单项选择题
If all the continents and mountains were bulldozed flat, the earth __ covered by water.
A．would be
B．would have been
C．would had been
D． would been
单项选择题
Ecology, __ the relationships between organisms and their environments, is also important in petroleum geology.
A．the study of
B．it study
C．that study
D．studying
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