单项选择题

With the change of red lights, there are long queues of vehicles that wait while a few people who walk across the zebr

A． wait... walkB. waiting... walkingC. waiting... walkD. wait... walking
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单项选择题
I always think of books with unutterable feelings, being deeply indebted to them, as I am, for the warmth they have brought me.
A．preferred
B．mixed
C．profound
D．dissatisfied
单项选择题
Through many years of evolution, your body has learned bow to respond to stress basing on its instinct for survival.
A．based on
B．taken on
C．founded on
D．built on
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