单项选择题

Scientists are eager to talk with other scientists working on similar problems．

A．科学家热衷于与从事类似课题研究的其他科学家交流。
B．科学家更容易与其他科学家谈话来解决相同的问题。
C．科学家很乐意在解决类似问题时同其他科学家交流。
D．科学家更容易就雷同的问题与其他科学家交谈。
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单项选择题
The main idea of this passage is ______.
A．the bicycle has become a practical form of transportation
B．transportation has changed through time
C．travelling in the countryside is difficult
D．bicycle travel is easy in the city
单项选择题
Two hundred years ago, people moved to cities ______.
A．to build special houses
B．to ride bicycles
C．to find jobs
D．to have a good time
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