单项选择题
People throughout the world are eating ______ meat per person as they did in 1950.
A．more than twice
B．twice much as
C．twice as much
D．twice more
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单项选择题
Natural selection is defined as the process ______ the course of evolution by preserving those traits best adapted for an organism's survival.
A．to which directs
B．of which directs it
C．directs it
D．that directs
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单项选择题
Advanced mammals such as monkeys, apes and humans have brains ______ from ancestors that took to living in. the trees.
A．derived
B．progressed
C．terminated
D．advanced
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