试题详情
阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
Diesel engines（柴油机） work on the same basic principles gasoline engines, but they do the work differently. Let's take a closer look.
The story of the diesel engine actually begins with the invention of the gasoline engine. Nikolaus August Otto （invent） the gasoline engine in 1861. His invention used the four-stroke combustion（四冲程燃烧） principle, also known as the "Otto Cycle", is the basis for most car engines today. In its early stage, the gasoline engine wasn't very efficient, and other major methods of transportation, such as the steam engine, performed （poor） as well. Only about 10 percent of the fuel （use） to power these types of engines actually moved a vehicle. The rest of the fuel simply produced useless heat.
Rudolf Diesel created an engine with high efficiency, and he devoted much of his time to （develop） a "combustion power engine". By 1892 Diesel had obtained a patent for we now call the diesel engine.
For decades, diesel engines had a reputation for being dirty and loud. While Europe adopted the technology pretty widely, most （drive） in the United States said, "No, thank you. " By the 21st century, though diesel engines became far cleaner, much （quiet） and even more efficient, they experienced a setback in popular opinion because of ascandal（丑闻） in 2014. Thanks to （they） proven efficiency, though, diesel engines are regaining some ground.
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