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  3. The rocket engine, with its steady roar like that of a waterfall or a thunderstorm, is an impressive symbol of the new space age

The rocket engine, with its steady roar like that of a waterfall or a thunderstorm, is an impressive symbol of the new space age

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问题     The rocket engine, with its steady roar like that of a waterfall or a thunderstorm, is an impressive symbol of the new space age. Rocket engines have【C1】______powerful enough to shoot astronauts【C2】______the earth’s gravitational pull and【C3】______them on the moon. We have now become【C4】______in space. Yuri Gagarin from Soviet Union was the first human to visit space on April 12, 1961. In the 108 minutes’ journey, he covered 40, 000 kilometers. China’s first astronaut into space is Yang Liwei. Impressive and complex【C5】______it may appear, the rocket, which was【C6】______in China over 800 years【C7】______, is a relatively simple device. Fuel that is【C8】______in the rocket engine changes【C9】______gas. The hot and rapidly【C10】______gas must escape, but it can do so only【C11】______an opening that【C12】______backward. As the gas is【C13】______with great force, it【C14】______the rocket in the【C15】______direction. Like the kick of a gun【C16】______it is fired, it【C17】______the laws of nature【C18】______by Sir Isaac Newton when he discovered that "【C19】______every action, there is【C20】______equal and opposite reaction. " Newton’s theories have contributed a great deal to the science of aeronautics.
【C20】
选项 A、no
B、an
C、another
D、the
答案B
解析 根据上下文，这里不是特指，只能用不定冠词，由于后面的词以元音开头，所以用an。
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