下列事实一定能证明HNO2是弱电解质的是（ ）
| A．用HNO2溶液做导电实验，灯泡很暗； | B．0.1 mol/L HNO2溶液的pH=2.1 |
| C．HNO2不是离子化物，而是共价化合物 | D．HNO2和NaCl不能发生反应 |
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| A．being run | B．run | C．to run | D．running |
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What I need is_____ book that contains ______ABC of oil painting.
| A．a; 不填 | B．the; 不填 | C．the; an | D．a ; the |
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