A:Amy
B:Amy's
C:Amy'
-- Anna, could you lend me this book, please?
-- I'm sorry. I it for only two days, and I haven't finished it yet.
红色方格占方格总数的____ ,也就是____%。橘色方格相当于红色方格的____ ,也就是____%。
下列排列顺序正确的是( )
①酸性:H3PO4>H2SO4>HClO4
②热稳定性:H2O>HF>H2S
③原子半径:Na>Mg>O
④还原性:F﹣>Cl﹣>S2﹣
⑤结合H+的能力:OH﹣>CH3COO﹣>Cl﹣.