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
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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