The traffic jams often happen in _______ hours.
A. lunch
B. work
C. leisure
D. rush
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Could you ______ the radio? I can’t hear it clearly.
A. turn up
B. turn on
C. turn down
D. turn out
Nowadays more and more people travel by ______, because it’s safe, cheap and fast.
A. foot
B. bike
C. high-speed train
D. boat
______ is the population of china?
A. How much
B. How many
C. How many people
D. What
塞罕坝的感人事迹感人是推进( )的一个生动范例。
A. 生态文明建设
B. 经济建设
C. 社会建设
D. 文化建设