如图是自动升降衣架的结构示意图，可以很方便地晾起和取下衣服，它是通过一些简单机械
题型：填空题
问题：
如图是自动升降衣架的结构示意图，可以很方便地晾起和取下衣服，它是通过一些简单机械的组合来实现此功能的.图中动滑轮有 个，此装置 （填“能”或“不能”）改变动力的方向.
题型：填空题
The World’s Most Impressive subways
小题1:Which of the following gives the passengers the best visual enjoyment?
A．The Tokyo Metro and Toei Lines．
B．The Moscow Metro．
C．The London Metro．
D．The Hong Kong MTR．小题2:According to the passage, the only subway that can bring more financial gains is ______．
A．the Tokyo Metro and Toei Lines
B．the Moscow Metro
C．the London Metro
D．the Hong Kong MTR小题3:We can learn from the passage that Shanghai Metro ______．
A．is the busiest system in the world
B．carries the most people each day
C．may be larger than the Chicago Subway in the future
D．has become the world's largest subway since it opened小题4:The purpose of the passage is to _____．
A．give us a brief introduction to some subway systems
B．introduce the working system of some railways station
C．tell the general background of world-wide transportation
D．show the historical development of underground system