问题
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The babies would" smile and bubble" at the lights because ______.A.the lights were directl
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The sun is shining in the sky and sending out ______ light and heat.A.a large number ofB.a
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Because film is______to light it must be kept in darkness to avoid exposure under the sun.
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Without the sun s light______the earth s surface, no life could exist on the earth.A.warms
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The sun is____________ far away from the earth.
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The sun heats the earth ______ makes it possible