2014年12月26日，兰州到乌鲁木齐高速列车全线开通，兰新高铁是世界上一次性里程最长的高速铁路。该铁路沿途能欣赏到的景观是（    ）

下列叙述错误的是（　　）

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根据短文内容，选择正确答案。

D

    Astronauts (宇航员) face many problems when living in space stations. One of them is food. People on Earth put together all the meals first and then send these meals to space stations by space shuttle. Because the food has to last a long time (sometimes up to three months), people have to store a lot of it in cans. The space station does not have a fridge, but it has a cool room to keep fruit and vegetables fresh. Astronauts also eat many other foods such as dried meat that do not need special care.

    Without the help of gravity sitting down to eat can be difficult. Astronauts sometimes have to fix themselves to the wall while eating. They also have to be very careful so that food does not float away.

下列语句中，正确的有（　　）

①相等的圆心角所对的弧相等；

②平分弦的直径垂直于弦；

③长度相等的两条弧是等弧；

④经过圆心的每一条直线都是圆的对称轴．

如图：已知在△ABC中，AB=AC，D为BC边的中点，过点D作DE⊥AB，DF⊥AC，垂足分别为E，F.求证：△BED≌△CFD.