如图所示，两轮用皮带传动，皮带不打滑，图中有A、B、C三点，这三点所在处的半径r_A＞r_B=r_C，则以下有关各点线速度v、角速度ω的关系中正确的是（   ）

2015年是“一带一路”（“丝绸之路经济带”和“21世纪海上丝绸之路”）国家战略积极推进年。下图为“一带一路”主要线路示意图。读图回答下列问题。

根据图A和图B回答问题：

①自然经济长时间内没有根本性突破     ②东西方的交流渠道不畅通

③手工业发展水平世界领先             ④对外贸易一直居出超地位

根据短文内容，选择最佳答案。

Scientists say life will be very different in 2050.First,there will be no TV channels (频道) . People will choose a programme (节目) from a computer and watch it on the television. We will get information on the computers only.

   Second, water will be a big problem. In many places, people won't have water to drink.

Third, cars will use new and clean fuels and they will go very fast. There will be a computer in every car. And computers will control the cars and there won't be any accidents (事故) .