43.D【解析】题意:对于红外辐射是正确的。
根据文章第六 段第一句Waves of infrared radiation are longer than waves of visible light和最后一句Although invisible to the eye,longer infrared radiation can be detected as warmth by the skin可知,红外辐射的光波比可见光波长,且红外辐射是不可见的,但是能被感知。所以D项说法正确,而A、B、C三项的说法都是错误的。故本题选D。
44.C【解析】题意:下列关于小行星的说法哪项是不正确的?
根据文章倒数第二段第三至五句Asteroids,for example,are giant rocks that float through space but they absorb most of the light that reaches them.They dont reflect light,so theyre diffi cult to see.But they do give off infrared radiation,so an infrared telescope like WISE will be able to produce images of them可得知小行星不反射光,却发出红外辐射。所以C项中小行星发射可见光的说法是错误的。而A项、B项和D项说法正确。故本题选C。
45.A【解析】题意:从最后一段可以推断出棕矮星。
通过最后一段最后一句Theyre so dim that theyre almost impossible to see with visible light, but in the infrared spectrum they glow可以得知,棕矮星红外光谱可测,证明它们发射红外辐射,所以 A项正确。本段第二句These objects arefailed starswhich means they are not massive enough to jump start the same kind of reactions that power stars such as the sun明确说明棕矮星与像太阳的供能星不同,所以B项错误。由本段第三句brown dwarfs simply shrink and cool down可知棕矮星并不活跃,所以C项错误。由本段第一句Brown dwarfs are another kind of deepspace object that will show up in WISES pictures可知WISE可以拍摄到棕矮星,所以D项错误。故本题选A。
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