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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.
【C1】
选项 A、shown
B、been
C、appeared
D、proved
答案D
解析 因其后接形容词powerful作表语，故应填系动词。shown不是系动词；been和appeared虽可作系动词但与句意不符；而proved可作系动词，意为“证明是”，符合句意。
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