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  3. The air surrounding us is important to everyone. Without air, we could not exist. Everyone understands that. But air is necessar

The air surrounding us is important to everyone. Without air, we could not exist. Everyone understands that. But air is necessar

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问题     The air surrounding us is important to everyone. Without air, we could not exist. Everyone understands that. But air is necessary in many other ways — ways that are not always so obvious or widely known.
    If we did not have air, there would be no sound. Sound travels through air. Where there is no air, there is no sound. Without air there would be no fire. There would be no automobiles, since motors need air in order to operate.
    Without air, there would be no wind or clouds. The night time would be very cold and the days very hot. We would be forced to seek shelter from the sun, as there would be no atmosphere to protect us from the sun’s deadly rays.
    In this huge ocean of air surrounding the earth, there is more energy than in all the coal, oil and gas we have on the earth. Electrical energy is collected in the atmosphere as water is collected and stored in a dam (大坝). The existence of electricity in the air has been known for centuries. Men have gazed in wonder at the bright patterns of lightening in storm clouds. But thorough (彻底的，深入的) study of electricity in the air was not possible until the development of radio.
It is not widely known that ______.
选项 A、air is important to human being
B、air is important to the earth
C、air is necessary in many other ways
D、air is necessary to the animals
答案C
解析 本题考查对句意的理解。根据文章第一段最后一句“But air is necessary in many other ways—ways that are not always so obvious or widely known”，可以得出答案[C]与其句意相符合。
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