单项选择题

A．The Rhythmic Cycle of the Sun and the Tide
B．Discoveries in Biology
C．A Scientific Study
D．A Living Clock
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单项选择题
One of the major difficulties of research into human health problems is the difficulty of ______.
A．knowing how many factors there are
B．isolating particular, individual factors from the complex human environment
C．knowing the complex human environment
D．increasing the number of the competent physicians
单项选择题
The emergence of the affluent society after World War Ⅱ_______.
A．gave birth to a new generation of upper class consumers
B．gave rise to the dominance of the new egoism
C．led to the reform of the retailing system
D．resulted in the worship of consumerism
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