红外线是一种看不见的光，通过红外线的照射，可以使物体的温度______；紫外线也是一种看不见的光，天然紫外线的重要来源是______，适当的紫外线照射有助于人体______，过量的紫外线照射对人体______．
紫外线照在物体上，物体的温度会升高；
太阳光中就含有紫外线，适量的紫外线有助于人体合成维生素D，但过量的紫外线照射却对人体有害．
故答案为：升高；太阳；合成维生素D；有害．
完形填空 （满分20分） Wings of Angel I used to hate myself because I wasn’t “normal”. Everyone else could pay on the monkey bars and ride on a bicycle, but not 41 . I had a severe spinal cord disorder(脊髓病) and I knew I would always be much 42 than others. I hated going to school and I hated people 43 at me. I hated seeing others smiling broadly and standing 44 and tall. And most of all, I hated looking in the 45 and seeing my ugly hunchback.(驼背) My friends found me 46 because I didn’t let others get close to me. I thought I was going to go on like this for the rest of my life 47 Angela appeared. That afternoon, I was sitting by myself in a corner of the school--- a spot where no one would 48 me. That’s when I first heard her voice. “Hi. Can I sit down?” I raised my head and there she was, with an irresistible smile on her round face. “What are you looking at?” she asked. “Ants.” “What are they doing?” “No 49 .” “I bet they’re playing games and making friends. Don’t you think so?” That was how our 50 started and it didn’t stop. We talked about everything under the sun---the ants, the clouds, my little niche(处境)---until it was sunset. Then suddenly, she saw my 51 . She just started. My heart 52 . What I feared most had happened and I knew for sure she would 53 me now. She stood up, pointed at my back and said, “I know 54 your back is hunched.” I closed my eyes like a criminal waiting to be 55 . I begged in my heart for her to 56 , but she just kept on going. “I know what you’ve got in there. Do you?” “No,” I answer 57 . She bent and whispered in my ears. “Your back is hunched because you’ve got a pair of wings from the angels.” I was 58 . I looked into her eyes and her 59 touched my heart. From that day on, I started to learn to 60 myself because I have the wings of an angel and a kind-hearted friend.
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