A.The long distance. | B.Too many participants. |
C.The dangerous blocking. | D.Serious injuries in forearms. |
A.James Lighthill is the first expert trying to model traffic flow. |
B.The denser the flow is, the faster the flow rate becomes. |
C.The flow rate increases in the beginning because fewer people passed together. |
D.The flow rate increases first and then decreases later when the flow is too denser. |
A.It has much less participants than the London Marathon in 2014. |
B.It has a shorter distance than the London Marathon. |
C.The route was changed because the traditional one is not safe any longer. |
D.The participants running this marathon will pass a tunnel because this choice is safer. |
A.Make a comparison between marathon and road traffic. |
B.Running a marathon is somewhat dangerous if it is not well organized. |
C.Introduce a new technology to solve the blocking problem in marathon. |
D.Some advice for people who are to run a marathon. |
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A.a(chǎn)waken people's environmental awareness |
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A.China | B.South Korea | C.Jin Dynasty | D.Tang and Song periods. |
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A.the most popular Internet technology in 2006 |
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C.one online game called Second Life |
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B.The people who play games on YouTube. |
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D.The people who are created in Second Life. |
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A.Setting a goal | B.Developing an ability |
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