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What Should Be Done with Urban Congestion
Rapid ......

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Sometimes online distance learning can be a problem because ______.
A．learners don’t have the money to pay for it
B．some learners don’t need face-to-face cues
C．it is face-to-face learning
D．some students feel it time consuming to read so many texts
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不久前，人们认为在太空旅行会遇到极大的危险，主要是辐射和被流星撞击。也许我们应当记得，即在不到两百年前，乘火车旅行似乎也同样令人生畏。
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