[填空题]A to develop a maglev train rail system
B To explain why maglev trains are faster
C to pull and push the train forward
D to create a magnetic field
E to experiment with the maglev train
F to travel from Paris to Rome in about two hours
You can connect a wire to the positive and negative ends of a battery ______.

[填空题]A to develop a maglev train rail system
B To explain why maglev trains are faster
C to pull and push the train forward
D to create a magnetic field
E to experiment with the maglev train
F to travel from Paris to Rome in about two hours
Several countries in the world are using strong electromagnets ______.

[单项选择]
The Docklands Light Railway (DLR) took just three years to build at a cost of ￡77 million. It is London’s first Light Rail System, but its route follows that of a number of older lines, which carried the nineteenth century railways through the crowed districts of the East End.
The section of the line from the Tower Gateway Station to Poplar follows the line of one of London’s earliest railways, the London & Blackwell (1840), a cable-drawn railway (later converted to steam) which carried passengers to steam ships at Blackwell Pier, and provided transport for the messengers and clerks who went backwards and forwards between the docks (码头) and the city every day.
From Poplar to Island Gardens, a new line crosses high above the dock waters, and then joins the old track of the Millwall Extension Railway, built to service the Millwall Docks (1868) and to provide transport for workers in the local facto
A. was constructed in the nineteenth century.
B. will be finished in three years’ time.
C. follows some of the original lines.
D. took three years longer than expected to complete.

[填空题]

The Singapore underground train system, known as the MRT, offers a speedy and easy way to get about our city. You’ll need small change to buy an individual ticket. Alternatively, buy a special ticket designed with the tourist in mind. Costing S $6 ,it offers S $5.50 worth of rides; the extra 50 cents is for keeping the ticket as a souvenir(纪念品). Tourist tickets feature one of three designs: the Chinese Gardens, the Victoria Memorial Hall or a night skyline of Singapore.
You gain entry to the trains by inserting your ticket into the barrier machine (检票闸机). Wait for the ticket to reappear and put it away safely: you’ll need it again. After your trip, you insert your ticket into the barrier in order to leave. Please note that each ticket is time coded on entry, and you are advised not to spend more than half an hour in addition to travel time, because tickets can expire (失效).
Moving stairs that take you to the platform and train destinations are m