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【单选题】
提取和分离叶绿体中色素的实验中，正确的操作顺序应该是（）A.
进行纸层析—制取滤液—在滤纸条上画线—将实验材料研磨
B.
制取滤液—进行纸层析—在滤纸条上画线—取滤液—再画线
C.
将实验材料剪碎、研磨—在滤纸条上画线—制取滤液—进行纸层析
D.
将实验材料剪碎、研磨—制取滤液—在滤纸条上画线—进行纸层析
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皮皮学刷刷变学霸
举一反三
【单选题】The sentence “ He could not sleep for noise without and fever within ” in paragraph 4 means “ HE could not sleep because . ”
A.
it was noisy outside and he had a fever
B.
it was quiet inside the hotel and he had a fever
C.
the hotel was so noisy that he became very excited
【单选题】Still, he could not help thinking that if anything______, the nearest person he could contact by radio, if there was a ship nearby, would be on an island 885 miles away.
A.
were happening
B.
should happen
C.
would happen
D.
had happened
【简答题】佝偻病主要与哪组物质缺乏有关（） |坏血病主要与哪种物质缺乏有关（）A. 铁B. 维生素AC. 锌D. 钙+维生素DE. 维生素C
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