閱讀下面短文，根據(jù)短文內(nèi)容完成句子。

There are many inventions that have caused great changes in the world. Here is a short introduction of the maglev train (磁懸浮). The history of the maglev train started in the beginning of the 1900s. The American Robert Goddard and the French Emile Bachelet came up with the idea of frictionless (無摩擦的) trains. But scientist didn’t succeed in making it at that time.

About 60 years later, the Japanese started their research on maglev transportation. After many years of experiments, the Japanese began to build their first test line. 7 km in 1975, and finished it in 1977. Many test runs started in July, 1977 with a speed of 517 km/h. In 1990, Japan built the Yamanashi Maglev test line. This test line was 42.8 km long and the first running test was held in 1997.

The Germans also started research on the maglev train in the early 1970s. It took them ten years to make the first track(ti)model. In 1993, the longest nonstop test running was 1,674 km. That same year the speed reached 450km/h.

China finished a 30-km-long maglev train line in Shanghai in 2003. This is the first commercial (商業(yè)的) maglev train line in the world. Although this project cost over 1 billion dollars, we should feel proud of it.

1.Robert Goddard and Emile Bachelet ________ the idea of frictionless trains.

2.In 1975, the Japanese began to build ________ of maglev trains.

3.The Germans spent ________ in making the first track model.

4.The Maglev train line in Shanghai is ________ long.

5.________ made the first commercial maglev train line.

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根據(jù)短文內(nèi)容，選擇最佳選項，并在答題卡上將選定答案的字母標號涂黑。

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“It is more than what I should do, honestly speaking.”

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