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
单项选择题
Although the end of the term was close ______, Jim had not completed all of the projects he had hoped to finish.
A．on hand
B．by hand
C．at hand
D．in hand
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