单项选择题

A．Three thousand years ago.
B．When man began to salt fish.
C．When man began to preserve the dead.
D．No one knows.
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单项选择题
Recent studies by the Council of Europe show that _______.
A．it is only in Britain that wildlife needs more protection
B．certain species of reptiles and butterflies in Europe need protecting
C．there are fewer species of reptiles and butterflies in Europe than elsewhere
D．all species of wildlife in Europe are in danger of dying out
单项选择题
A child’’s development might well be adversely affected if______.
A．he were subjected to unusually strict ’’discipline
B．his mother often gave in to his demands
C．his energies were freely given an outlet
D．he were brought up in a happy environment
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