皮皮学，免费搜题
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【简答题】
听下面一段材料，回答第1-4题。 1. How many people died in the accident? A. Four. B. Over ten. C. More than thirty. 2. How many people were on the bus? A. Forty-two. B. Forty-seven. C. Forty-nine. 3. What were the students doing when the accident happened? A. Sleeping. B. Enjoying music. C. Preparing for a concert. 4. What else can we learn from the news? A. School had to be closed on Friday. B. Some of the injured are still under treatment. C. The accident was caused by careless driving.
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【简答题】acute 1 hidden 2 often 3 rich 4 sharp 5 angle 6 hearing 7 illness 8 stones 填入答案序号()()()()
【简答题】能以相同的吸收率且部分地吸收由零到∞的所有波长范围的辐射能的物体称为______；反射率等于1的物体称为______；透过率等于1的物体称为______；吸收率等于1的物体称为______。